Have you ever wondered how you can see your image in a mirror or how a pair of eyeglasses can make you see things clearly? They are applications in our daily life of the concepts of Ray Optics, which are well detailed in Chapter 9 of Physics Class 12 - Ray Optics and Optical Instruments. The chapter concerns the law of reflection and refraction and the operation of optical instruments such as the human eye, microscope, telescope and camera.
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The NCERT Solutions for Class 12 Physics Chapter 9 - Ray Optics and Optical Instruments are prepared by subject experts as per the current CBSE syllabus. They offer a step-by-step and correct answer to every exercise problem, which guarantees conceptual clarity to students. These NCERT solutions not only reinforce the preparation of fundamentals for CBSE Class 12 board exams, but also for competitive exams like JEE and NEET. To enhance the convenience, students even have a free PDF of NCERT Solutions for Class 12 Physics Chapter 9 - Ray Optics and Optical Instruments, which they could download, and hence revising and practising any time and anywhere becomes easy. These solutions are a great tool in studying to do well in exams with descriptive explanations and solved examples, alongside specific techniques of solving problems.
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The Class 12 Physics Chapter 9 - Ray Optics and Optical Instruments question answers explain reflection, refraction, and the work or mechanism of lenses and mirrors in a simple way. These step-by-step solutions are very beneficial in board exams and competitive exams such as JEE and NEET. Students may also download the free PDF to revise and rehearse it anywhere, improving the preparation.
Class 12 Physics Chapter 9 - Ray Optics and Optical Instruments exercise questions assist students in training fundamental concepts such as image formation, lens, and mirror equations and the functioning of optical instruments. The Ray Optics and Optical Instruments class 12 question answers offer clear and step-wise solutions that enhance conceptual clarity and exam preparation.
Answer:
Given, size of the candle, h = 2.5 cm
Object distance, u = 27 cm
The radius of curvature of the concave mirror, R = -36 cm
focal length of a concave mirror = R/2 = -18 cm
let image distance = v
Now, as we know
Now, let the height of the image be
Magnification of the image is given by
from here
Hence, the size of the image will be -5cm. The negative sign implies that the image is inverted and real
If the candle is moved closer to the mirror, we have to move the screen away from the mirror in order to obtain the image on the screen. If the image distance is less than the focal length image cannot be obtained on the screen, and the image will be virtual.
Answer:
Given the height of the needle, h = 4.5 cm
distance of object = 12 cm
focal length of convex mirror = 15 cm.
Let the distance of the image be v
Now, as we know
v = 6.7 cm
Hence, the distance of the image is 6.7 cm from the mirror, and it is on the other side of the mirror.
Now, let the size of the image be h'
so.
Hence, the size of the image is 2.5 cm. The positive sign implies the image is erect, virtual and diminished.
Magnification of the image =
m = 0.56
The image will also move away from the mirror if we move the needle away from the mirror, and the size of the image will decrease gradually.
Answer:
Given:
Actual height of the tank,h = 12.5 cm
Apparent height of tank,h' = 9.4 cm
let refrective index of the water be
So the refractive index of water is approximately 1.33.
Now, when water is replaced with a liquid having
Hence, the new apparent height of the needle is 7.67 cm.
Total distance we have to move in a microscope = 9.4 - 7.67 = 1.73 cm.
Since the new apparent height is less than the previous apparent height, we have to move UP the microscope in order to focus the needle.
Answer:
As we know, by Snell's law
Now, applying it to fig (a)
Now applying for fig (b)
Now in fig (c) let the refraction angle be
Therefore, the angle of refraction when the ray goes from water to glass in Figure (c) is 38.68.
Answer:
Rays of light will emerge in all directions and up to the angle when total internal reflection starts, i.e. when the angle of refraction is 90 degrees.
Let the incident angle be i when the refraction angle is 90 degrees.
So, by Snell's law
from here, we get
Now let R be the Radius of the circle of the area from which the rays are emerging. and d be the depth of water, which is = 80 cm.
From the figure:
R = 91 cm
So the area of the water surface through which the rays will be emerging is
therefore required area
Answer:
In Prism :
Prism angle (
also, Deviation angle (
The deviation angle is minimum when the incident angle(
from (1) and (2)
We also have
Now applying Snell's law using equations (3) and (4)
Given
Putting those values in (5), we get
Hence, the refractive index of the prism is 1.532.
Now, when the prism is in the water.
Applying Snell's law:
Hence minimum angle of deviation inside water is 10.32 degrees.
Answer:
As we know, the lens maker's formula
[ This is derived by considering the case when the object is at infinity and the image is at the focus]
Where
Here,
Given,
Putting these values in the equation,
Hence Radius of curvature of the lens will be 22 cm.
Answer:
In any Lens :
a)
Here, the beam converges from the convex lens to point P. This image P will now act as an object for the new lens, which is placed 12 cm from it and focal length being 20 cm.
So,
Hence distance of the image is 7.5 cm, and it will form towards the right as the positive sign suggests.
b)
Here, Focal length
so,
Hence image distance will be 48 cm in this case, and it will be in the right direction(as the positive sign suggests)
Answer:
In any Lens;
Here given,
Hence image distance is -8.4 cm. The negative sign indicates the image is erect and virtual.
Also, as we know,
From Here
Hence, the height of the image is 1.8 cm.
As we move the object further away from the lens, the image will shift toward the focus of the lens, but will never go beyond that. The size of the object will decrease as we move away from the lens.
Answer:
When two lenses are in contact, the equivalent is given by
where
So, Given,
Putting these values we get,
Hence equivalent focal length will be -60 cm, and since it is negative, the equivalent is behaving as a concave lens, which is also called a diverging lens.
Answer:
In a compound microscope, first, the image of an object is made by the objective lens, and then this image acts as an object for the eyepiece lens.
Given
the focal length of objective lens =
focal length of eyepiece lense =
Distance between the objective lens and eyepiece lens = 15 cm
a)
Now in the Eyepiece lens
Image distance =
focal length =
Now, this object distance
The distance of
So in the objective lens
Hence, the object distance required is -2.5 cm.
Now, the magnifying power of a microscope is given by
So putting these values
Hence, the lens can magnify the object 20 times.
b) When the image is formed at infinity
in the eyepiece lens,
from here
in the optical lens:
Now,
Putting the values, we get,
Hence magnifying power, in this case, is 13.51.
Q 9.12 A person with a normal near point (25 cm) using a compound microscope with objective of focal length 8.0 mm and an eyepiece of focal length 2.5cm can bring an object placed at 9.0mm from the objective in sharp focus. What is the separation between the two lenses? Calculate the magnifying power of the microscope
Answer:
Inside a microscope,
For the eyepiece lens,
We are given
We can also find this value by finding the image distance in the objective lens.
So, in the objective lens
We are given
Distance between object lens and eyepiece =
Now,
Magnifying power :
Hence magnifying power for this case will be 88.
Answer:
The magnifying power of the telescope is given by
Here, given,
focal length of objective lens =
focal length of eyepiece lens =
Hence magnifying power of the telescope is 24.
In the telescope distance between the objective and eyepiece, the lens is given by
Therefore, the distance between the two lenses is 250 cm.
Answer:
Angular magnification in the telescope is given by :
angular magnification =
Here given,
focal length of objective length = 15m = 1500cm
The focal length of the eyepiece = 1 cm
So, angular magnification,
Answer:
Given,
The radius of the lunar orbit,r =
The diameter of the moon,d =
focal length
Let
Now,
The angle subtended by the diameter of the moon will be equal to the angle subtended by the image,
Hence, the required diameter is 13.74cm.
Answer:
The equation we have for a mirror is:
Given condition
Here,
Answer:
In a convex mirror focal length is positive conventionally.
So we have the mirror equation
Here, since object distance is always negative whenever we put our object on the left side of the convex mirror(which we always do, generally). So
Q 9.15 (c) Use the mirror equation to deduce that the virtual image produced by a convex mirror is always diminished in size and is located between the focus and the pole.
Answer:
In a convex mirror focal length is positive conventionally.
So we have the mirror equation
Here since
which means the image will always lie between the pole and the focus.
Now,
Here, since
Q 9.15 (d) Use the mirror equation to deduce that an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image.
Answer:
The focal length
Also, conventionally, the object distance
So we have the mirror equation:
Now in this equation, whenever
Now,
Since the denominator is always less than the numerator, the magnitude magnification will always be greater than 1
Hence, we conclude that the image is always gonna be enlarged.
Henc,e an object placed between the pole and the focus of a concave mirror produces a virtual and enlarged image.
Answer:
As we know,
Refractive index =
Here actual depth = 15cm
let apparent depth be d'
And the refractive index of the glass = 1.5
Now putting these values, we get,
the change in the apparent depth = 15 - 10 = 5 cm.
As long as we are not taking the slab away from the line of sight of the pin, the apparent depth does not depend on the location of the slab.
Answer:
We are given,
Refractive index of glass(
Now applying Snell's law on the upper glass - outer layer,
At this angle, in the air-glass interface
Refraction angle
Let Incident Angle be
Applying Snell's law
Hence total range of incident angles for which total internal reflection happens is
Q 9.17 (b) What is the answer if there is no outer covering of the pipe?
Answer:
In the case when there is no outer layer,
Snell's law at the glass-air interface(when the ray is emerging from the pipe)
refractive angle
The angle r is greater than the critical angle
So for all of the incident angles, the rays will get totally internally reflected. In other words, rays won't bend in air-glass interference; they would rather hit the glass-air interference and get reflected
Answer:
As we know, for a real image, the maximum focal length is given by
where d is the distance between the object and the lens.
So putting values we get,
Hence maximum focal length required is 0.75.
Answer:
As we know that the relation between focal length
Given:
so
Hence, the focal length of the convex lens is 21.39 cm.
Q 9.20 (a) Determine the ‘effective focal length’ of the combination of the two lenses in Exercise 9.10, if they are placed 8.0cm apart with their principal axes coincident. Does the answer depend on which side of the combination a beam of parallel light is incident? Is the notion of effective focal length of this system useful at all?
Answer:
Here, there are two cases, the first one is the one when we see it from the convex side, i.e. Light is coming from infinity and going into the convex lens first and then goes to the concave lens afterwards. The second case is just the reverse of the first case, i.e. light rays are going into the concave mirror first.
1)When light is incident on a convex lens first
Now this will act as an object for the concave lens.
Hence parallel beam of rays will diverge from this point, which is (220 - 4 = 216) cm away from the centre of the two lenses.
2) When rays fall on the concave lens first
Now this will act as an object for a convex lens.
Hence parallel beam will diverge from this point, which is (420 - 4 = 146 cm ) away from the centre of the two lenses.
As we have seen for both cases, we have different answers, so yes, answers depend on the side of incidence when we talk about combining lenses. i.e.. We can not use the effective focal length concept here.
Answer:
Given
Object height = 1.5 cm
Object distance from convex lens = -40cm
According to the lens formula
Magnification due to a convex lens:
The image of the convex lens will act as an object for the concave lens,
so,
Magnification due to a concave lens :
The combined magnification:
Hence, height of the image =
= 0.652 * 1.5 = 0.98cm
Hence height ofthe image is 0.98cm.
Answer:
Let the prism be ABC,
as emergent angle
Now, as we know in the prism
Hence,
Now applying Snell's law at surface AB
Hence, the angle of incidence is 29.75 degrees.
Q 9.22 A card sheet divided into squares each of size 1 mm2 is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held close to the eye.
(b) What is the angular magnification (magnifying power) of the lens?
(c) Is the magnification in (a) equal to the magnifying power in (b)? Explain.
Answer:
Given,
Object distance u = -9cm
Focal length of convex lens = 10cm
According to the lens formula
a) Magnification
The area of each square in the virtual image
b) Magnifying power
c) No,
Both the quantities will be equal only when the image is located at the near point |v| = 25 cm
(b) What is the magnification in this case?
(c) Is the magnification equal to the magnifying power in this case?
Answer:
a)maximum magnification is possible when our image distance is equal to the minimum vision point, that is,
Now, according to the lens formula
Hence required object distance for viewing squares distinctly is 7.14 cm away from the lens.
b)
Magnification of the lens:
c)
Magnifying power
Since the image is forming at the near point ( d = 25 cm ), both magnifying power and magnification are the same.
Answer:
Given
Virtual image area = 6.25
Actual ara = 1
We can calculate linear magnification as
We also know
Now, according to the lens formula
Since the image is forming at a distance which is less than 25 cm, it can not be seen by eye distinctly.
Answer:
Angular magnification is the ratio of tangents of the angle formed by the object and image from the centre point of the lens. In this question angle formed by the object and a virtual image is the same, but it provides magnification in a way that, whenever we have an object placed before 25cm, the lens magnifies it and makes it in the vision range. By using magnification, we can put the object closer to the eye and still see it, which we couldn't have done without magnification.
Answer:
Yes, angular magnification will change if we move our eye away from the lens. This is because the angle subtended by the lens would be different from the angle subtended by the eye. When we move our eye from the lens, angular magnification decreases. Also, one more important point here is that object distance does not have any effect on angular magnification.
Answer:
Firstly, grinding a lens with a very small focal length is not easy, and secondly and more importantly, when we reduce the focal length of a lens, spherical and chromatic aberration become more noticeable. They both are defects of the image, resulting from the way of the rays of light.
Q 9.25 (d) Why must both the objective and the eyepiece of a compound microscope have short focal lengths?
Answer:
We need more magnifying power and angular magnifying power in a microscope in order to use it effectively. Keeping both objective focal length and eyepiece focal length small makes the magnifying power greater and more effective.
Answer:
When we view through a compound microscope, our eyes should be positioned a short distance away from the eyepiece lens for seeing a clearer image. The image of the objective lens in the eyepiece lens is the position for best viewing. It is also called "eye-ring" and all reflected rays from the lens pass through it, which makes it the ideal position for the eye for the best view.
When we put our eyes too close to the eyepiece lens, then we catch the lesser refracted rays from the eyes, i.e. we reduce our field of view because of which affects the clarity of the image gets affected.
Answer:
Given,
magnifying power = 30
objective lens focal length
eyepiece lens focal length
Normally, the image is formed at a distance d = 25cm
Now, by the formula;
Angular magnification by eyepiece:
From here, magnification by the objective lens :
According to the lens formula:
from here,
Hence object must be 1.5 cm away from the objective lens.
Now for the eyepiece lens:
Hence, the object is 4.17 cm away from the eyepiece lens.
The separation betweenthe objective and eyepiece lens
Answer:
Given,
The focal length of the objective lens
The focal length of the eyepiece lens
Normally, the least distance of vision = 25cm
Now,
As we know, magnifying power:
Hence magnifying power is 28.
Answer:
Given,
The focal length of the objective lens
The focal length of the eyepiece lens
Normally, the least distance of vision = 25cm
Now,
As we know magnifying power when the image is at d = 25 cm is
Hence, magnification, in this case, is 33.6.
Answer:
a) Given,
focal length of the objective lens =
focal length of the eyepiece lens =
The separation between the objective lens and eyepiece lens is given by:
Hence, under normal adjustment separation between the two lenses of the telescope is 145 cm.
Answer:
Given,
focal length of the objectove lens =
focal length of the eyepiece lens =
Height of tower
Distance of object which is acting like an object
The angle subtended by the tower at the telescope
Now, let the height of the image of the tower by the objective lens is
angle made by the image of the objective lens :
Since both the angles are the same, we have
Hence, the height of the image of the tower formed by the objective lens is 4.7 cm.
Q 9.28 (c) What is the height of the final image of the tower if it is formed at 25cm
Answer:
Given, the image is formed at a distance
As we know, the magnification of the eyepiece lens is given by :
Now,
Height of the final image is given by :
Therefore, the height of the final image will be 28.2 cm
Answer:
Given,
Distance between the objective mirror and secondary mirror
The radius of curvature of the Objective Mirror
So the focal length of the objective mirror
The radius of curvature of the secondary mirror
So, the focal length of the secondary mirror
The image of an object which is placed at infinity, in the objective mirror, will behave like a virtual object for the secondary mirror.
So, the virtual object distance for the secondary mirror
Now, applying the mirror formula in the secondary mirror:
Answer:
Given
Angle of deflection
The distance of the screen from the mirror
The reflected rays will be deflected by twice the angle of deviation, that is
Now, from the figure, it can be seen that
Hence displacement of the reflected spot of the light is
Answer:
Given
The focal length of the convex lens
Here liquid is acting like a mirror, so,
The focal length of the liquid
the focal length of the system(convex + liquid)
The equivalent focal length when two optical systems are in contact
Now, let us assume the refractive index of the lens to be
The radius of curvature is
As we know,
Now, let the refractive index of the liquid be
The radius of curvature of the liquid in the plane mirror side = infinite
Radius of curvature of liquid in lens side R = -30cm
As we know,
Therefore, the refractive index of the liquid is 1.33.
Class 12 Physics Chapter 9 - Ray Optics and Optical Instruments HOTS questions are designed to test a deep understanding of concepts like refraction, total internal reflection, and optical instruments. These advanced problems sharpen problem-solving skills and are highly useful for board exams as well as JEE and NEET preparation.
Q.1 A convex lens made of glass (refractive index
Answer:
(i) divided by (ii)
Q.2 An Ice cube has a bubble inside. When viewed from one side, the apparent distance of the bubble is
Answer:
let side of the cube is
refractive index
When viewing the bubble from one side, the depth is
When viewing the bubble from the opposite side, the true depth is
(since the side of the cube is
from i and ii
So,
The nearest integer is 4
so n=4
Q.3 A point object is moving with a speed of v before an arrangement of two mirrors as shown in the figure.
Find the velocity of image in mirror
Answer:
Velocity of image,
Q.4 A metal plate is lying at the bottom of a tank full of a transparent liquid. The height of the tank is 100cm, but the plate appears to be at 45 cm abovethe bottom. The refractive index of the liquid is:
Answer:
Real depth of plate,
The apparent depth of the plate,
Q. 5 Two lenses are placed in contact with each other, and the focal length of the combination is 80cm. If the focal length of one is 20cm, then the power of the other will be:
Answer:
The focal length of the combination,
Class 12 Physics Chapter 9 - Ray Optics and Optical Instruments deals with reflection, refraction, total internal reflection, prism, formulae of lens and mirror, the working of microscopes and telescopes. These concepts act as the basis of the comprehension of image formation and optical devices in the board exams, as well as in the competitive exams.
9.1 Introduction
9.2 Reflection of light by spherical mirrors
9.2.1 Sign convention
9.2.2 Focal length of spherical mirrors
9.2.3 The mirror equation
9.3 Refraction
9.4 Total internal reflection
9.4.1 Total internal reflection in nature and its technological applications
9.5 Refraction at spherical surfaces and by lenses
9.5.1 Refraction at a spherical surface
9.5.2 Refraction by a lens
9.5.3 Power of a lens
9.5.4 Combination of thin lenses in contact
9.6 Refraction through a prism
9.7 Optical instruments
9.7.1 The microscope
9.7.2 Telescope
The significant equations of Class 12 Physics Chapter 9: Ray optics and optical instruments will serve as a quick reference guide to solve numerical problems on reflection and refraction as well as the functioning of optical instruments. These formulas play an important role in both board exams and in competitive exams such as JEE and NEET, in helping students revise faster and be able to apply the concepts learned correctly in solving problems.
Where
Where
Where
At minimum deviation:
Where
Where
Where
Where
It is essential to have a good understanding of reflection, refraction, lens formula, mirror equation, and optical instruments to solve questions on Chapter 12 Physics Class 9 Ray Optics and Optical Instruments. Students will have to use sign conventions, lights ray geometry and formulae with care and caution to ensure that problems are solved accurately and precisely, both theoretically and numerically. The step-by-step approach is systematic and makes everything clear and precise.
Determine what problem is on reflection, refraction, or total internal reflection (TIR) and optical instruments.
Learn the corresponding laws e.g. Snell law, laws of reflection, or lens/mirror formula.
Draw a Proper Ray Diagram
Image formation can be visualized using neat ray diagrams.
Make sure to mark incident rays and refracted rays as well as normals so that they are not confused.
Use Sign Convention (New Cartesian Convention):
In the case of mirrors and lenses, obey strictly the sign conventions, i.e. distances which are measured against the direction of incident light are negative, and those in the direction of incident rays are positive.
Use Standard Formulas Accurately:
Mirror formula: $\frac{1}{f}=\frac{1}{v}+\frac{1}{u}$
Lens formula: $\frac{1}{f}=\frac{1}{v}-\frac{1}{u}$
Magnification in lens: $M=\frac{h^{\prime}}{h}=\frac{v}{u}$
Break Down Complex Problems:
In the case of many refractions (such as a lens-system or prism) solve step-by-step.
Treat air-glass (glass-air) interfaces individually and acquire the results and combine.
Check Units and Consistency:
Before proceeding to substitution, all measurements should be converted to one common unit (cm, m etc.).
Check your calculation again with regards to sign errors.
Relate to Real-Life Applications:
Connect numerical results with practical understanding (e.g., why convex lenses form real images, how prisms disperse light, etc.).
Beyond NCERT, students preparing for JEE/NEET should focus on advanced concepts of Ray Optics like derivations of lens-maker’s formula, optical path, dispersion and achromatic combination of lenses, resolving power of optical instruments, and advanced problems on prism and total internal reflection. These additional concepts strengthen problem-solving skills and help tackle tricky application-based questions in competitive exams.
NCERT Solutions for Class 12 Physics provide chapter-wise detailed answers to all textbook exercises, making it easier for students to grasp tough concepts. These step-by-step solutions are designed as per the latest CBSE syllabus and are highly useful for both board exams and competitive exams like JEE & NEET. With chapter-wise links, students can directly access the solutions and download the PDFs for quick and effective revision.
Frequently Asked Questions (FAQs)
The NCERT Solutions for Class 12 Physics Chapter 9 PDF includes step-by-step answers to textbook questions, explanations of key concepts, and diagrams to help you understand Ray Optics and Optical Instruments better.
The Ray Optics Class 12 NCERT PDF is very helpful for board exams as it is based on the CBSE syllabus and includes solved exercises, conceptual clarity, and practice problems aligned with exam patterns.
Yes, Wave Optics Class 12 NCERT Solutions are available in PDF format for free download. These solutions cover important topics like interference, diffraction, and polarization, which are essential for CBSE and competitive exams.
The right study materials should be chosen by Class 12 students in order to encourage efficient textbook problem-solving. Finding the best reference book from the many available on the market demands for a lot of patience. In Careers360 the answers to the chapter- and exercise-specific issues are given in PDF format. Students can use it to quickly dispel their doubts while working through challenges.
From the NCERT chapter ray optics, 6 to 9 marks questions are asked for CBSE board exam
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