Pearson | PTE
Register now for PTE & Unlock 20% OFF : Use promo code: 'C360SPL20'. Valid till 31st DEC'24! Trusted by 3,500+ universities globally
NCERT Exemplar Class 12 Physics solutions chapter 9 is one of the most scoring chapters from the view of exams and gives an insight on various different topics related to visible light. NCERT Exemplar Class 12 Physics chapter 9 solutions deals with various phenomena relating to light and explains the concept of reflection of light by spherical mirrors. Class 12 Physics NCERT Exemplar solutions chapter 9 also contains various mathematical derivations for different terms relating to such concepts, such as for obtaining the focal length of spherical mirrors and mirror equations which help in obtaining different values out of some given information. NCERT chapter ray optics also explains the phenomena of refraction and total internal reflection in detail along with its practical application in the surrounding nature. Students can make use of NCERT Exemplar Class 12 Physics solutions chapter 9 PDF download for preparing for exams.
Latest: JEE Main high scoring chapters | JEE Main 10 year's papers
Recommended: NEET high scoring chapters
Also see - NCERT Solutions for Class 12 Physics
Question:1
Answer:
The correct option is (a)Question:2
A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is
A. blue
B. green
C. violet
D. red
Answer:
The emerging colour would be (d) red, because of the relation which provides the velocity of a wave. During the changing of the mediums, the frequency of the wave remains constant. So, or wavelength is directly proportional to speed.Question:3
An object approaches a convergent lens from the left of the lens with a uniform speed 5 m/s and stops at the focus. The image
A. moves away from the lens with a uniform speed 5 m/s.
B. moves away from the lens with uniform acceleration.
C. moves away from the lens with a non-uniform acceleration.
D. moves towards the lens with a non-uniform acceleration.
Answer:
The answer is the option (c).Question:4
A passenger in an aeroplane shall
A. never see a rainbow.
B. may see a primary and a secondary rainbow as concentric circles.
C. may see a primary and a secondary rainbow as concentric arcs.
D. shall never see a secondary rainbow.
Answer:
The answer is the option (b)Question:5
You are given four sources of light each one providing a light of a single colour – red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is 90°. Which of the following statements is correct if the source of yellow light is replaced with that of other lights without changing the angle of incidence?
A.The beam of red light would undergo total internal reflection.
B. The beam of red light would bend towards normal while it gets refracted through the second medium.
C. The beam of blue light would undergo total internal reflection.
D. The beam of green light would bend away from the normal as it gets refracted through the second medium.
Answer:
The answer is the option (c).Question:6
The radius of curvature of the curved surface of a Plano-convex lens is 20 cm. If the refractive index of the material of the lens be 1.5, it will
A. act as a convex lens only for the objects that lie on its curved side.
B. act as a concave lens for the objects that lie on its curved side.
C. act as a convex lens irrespective of the side on which the object lies.
D. act as a concave lens irrespective of side on which the object lies.
Answer:
The correct answer is option (c) act as a convex lens irrespective of the side on which the object liesQuestion:7
The phenomena involved in the reflection of radio waves by ionosphere is similar to
A. reflection of light by a plane mirror.
B. total internal reflection of light in air during a mirage.
C. dispersion of light by water molecules during the formation of a rainbow.
D. scattering of light by the particles of air.
Answer:
The answer is the option (b)Question:8
Answer:
Question:9
Answer:
Question:10
A car is moving with at a constant speed of on a straight road. Looking at the rearview mirror, the driver finds that the car following him is at a distance of 100 m and is approaching with a speed of . In order to keep track of the car in the rear, the driver begins to glance alternatively at the rear and side mirror of his car after every 2 s till the other car overtakes. If the two cars were maintaining their speeds, which of the following statement (s) is/are correct?
A. The speed of the car in the rear is .
B. In the side mirror the car in the rear would appear to approach with a speed of to the driver of the leading car.
C. In the rearview mirror the speed of the approaching car would appear to decrease as the distance between the cars decreases.
D. In the side mirror, the speed of the approaching car would appear to increase as the distance between the cars decreases.
Answer:
The answer is the option (d).Question:12
Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted because
A. the apparent depth of the points close to the edge are nearer the surface of the water compared to the points away from the edge.
B. the angle subtended by the image of the object at the eye is smaller than the actual angle subtended by the object in air.
C. some of the points of the object far away from the edge may not be visible because of total internal reflection.
D. water in a trough acts as a lens and magnifies the object.
Answer:
All three (a, b, c) are the correct options.Question:13
A rectangular block of glass ABCD has a refractive index 1.6. A pin is placed midway on the face AB (Fig. 9.4). When observed from the face AD, the pin shall
A. appear to be near A.
B. appear to be near D.
C. appear to be at the centre of AD.
D. not be seen at all.
Answer:
Question:14
Between the primary and secondary rainbows, there is a dark band known as Alexandra’s dark band. This is because
A. light scattered into this region interfere destructively.
B. there is no light scattered into this region.
C. light is absorbed in this region.
D. angle made at the eye by the scattered rays with respect to the incident light of the sun lies between approximately 42° and 50°.
Answer:
Formed because of light scattered into the region interfere destructively the dark Alexander's band lie between the primary and secondary rainbow; thus, (a, d) are the correct options. The angle of the primary rainbow in the observer's eyes is from 41° to 42°, and in the secondary rainbow, the angle in the observer's eyes lies between 51° to 54° with respect to the incident light ray.Question:15
A magnifying glass is used, as the object to be viewed can be brought closer to the eye than the normal near point. This results in
A. a larger angle to be subtended by the object at the eye and hence viewed in greater detail.
B. the formation of a virtual erect image.
C. increase in the field of view.
D. infinite magnification at the near point.
Answer:
Right options are - (a, b)Question:16
An astronomical refractive telescope has an objective of focal length 20m and an eyepiece of focal length 2cm.
A. The length of the telescope tube is 20.02m.
B. The magnification is 1000.
C. The image formed is inverted.
D. An objective of a larger aperture will increase the brightness and reduce chromatic aberration of the image.
Answer:
The right answers to this question are options (a, b, and c)Question:17
Will the focal length of a lens for red light be more, same or less than that for blue light?
Answer:
The refractive index depends on the colour of light or wavelength of light.Question:19
Answer:
For a given object position if the focal length of the lens does not change, the image position remains unchanged.Question:20
Answer:
Key concept : Coordinate convention: At the first surface (+upward and -ve downward)The position of image O after the refraction from surface-1. If seen from , the apparent depth is
The negative sign indicates that it is on the side of the object.
Since the image formed by surface-1. It will act as an object for surface-2. If seen from , the apparent depth is .
Similarly, the image formed by medium 2, acts as an object for medium 3
Finally the image formed by surface -2 will act as an object for surface-2. If seen from outside, the apparent depth is
Hence apparent depth of odt is
Important point:
Apparent depth (distance of final image from final surface)
Question:22
Answer:
Thin mirror formula :Question:23
Answer:
Question:24
Answer:
The focal length will remain the same for each of the parts in case an asymmetric lens is cut in two parts parallel to the principle axis. In such a case the intensity of image that has been formed by every part will be lower in comparison to that of the complete lens.Question:25
Answer:
This method is known as the "Displacement method" is also used to find the confocal length of the length in laboratoryQuestion:26
Answer:
Question:27
Answer:
Key concepts :Question:28
Answer:
Let the ray incident on face AB at angle i, after refraction, it travels along PQ and then interact with face AC which is perpendicular to the incident face.Question:29
Answer:
Let us consider a portion of a ray between x and inside the liquid solution.Question:30
Answer:
Question:31
Answer:
Question:32
(i) Consider a thin lens placed between a source (S) and an observer (O) (Fig. 9.8). Let the thickness of the lens vary as where b is the vertical distance from the pole. is a constant. Using Fermat’s principle i.e. the time of transit for a ray between the source and observer is an extremum; find the condition that all paraxial rays starting from the source will converge at a point O on the axis. Find the focal length.
(ii) A gravitational lens may be assumed to have a varying width of the form
Show that an observer will see an image of a point object as a ring about the center of the lens with an angular radius
Answer:
· NCERT Exemplar Solutions For Class 12 Physics chapter 9 covers questions related to the phenomena of refraction by the lenses and how formulas are derived out of it to calculate the Power and combination of lenses required.
· Class 12 Physics NCERT Exemplar solutions chapter 9 also explores the diagrammatic representation of total internal reflection in different objects of different shapes such as a prism, diamond, etc.
· Most importantly, NCERT Exemplar Class 12 Physics solutions chapter 9 gives full detailed insight into different optical instruments such as the eye, the microscope, and the telescope, the phenomena associated, the principles used, and the detailed process of such happenings.
Also read NCERT Solution subject wise
Register now for PTE & Unlock 20% OFF : Use promo code: 'C360SPL20'. Valid till 31st DEC'24! Trusted by 3,500+ universities globally
Must read NCERT Notes subject wise
Also Check NCERT Books and NCERT Syllabus here:
This chapter has the highest weightage in the board exam, thus scoring well in this chapter will help in scoring in the final paper.
Each and every question is solved in complete detail covering the basics, the numericals and the diagrams in NCERT exemplar Class 12 Physics solutions chapter 9.
One will cover almost every topic related to ray optics; like reflection, refraction, dispersion, TIR, optical instruments etc.
Application Date:21 November,2024 - 20 December,2024
Application Date:21 November,2024 - 20 December,2024
Exam Date:03 December,2024 - 13 December,2024
Hello there! Thanks for reaching out to us at Careers360.
Ah, you're looking for CBSE quarterly question papers for mathematics, right? Those can be super helpful for exam prep.
Unfortunately, CBSE doesn't officially release quarterly papers - they mainly put out sample papers and previous years' board exam papers. But don't worry, there are still some good options to help you practice!
Have you checked out the CBSE sample papers on their official website? Those are usually pretty close to the actual exam format. You could also look into previous years' board exam papers - they're great for getting a feel for the types of questions that might come up.
If you're after more practice material, some textbook publishers release their own mock papers which can be useful too.
Let me know if you need any other tips for your math prep. Good luck with your studies!
It's understandable to feel disheartened after facing a compartment exam, especially when you've invested significant effort. However, it's important to remember that setbacks are a part of life, and they can be opportunities for growth.
Possible steps:
Re-evaluate Your Study Strategies:
Consider Professional Help:
Explore Alternative Options:
Focus on NEET 2025 Preparation:
Seek Support:
Remember: This is a temporary setback. With the right approach and perseverance, you can overcome this challenge and achieve your goals.
I hope this information helps you.
Hi,
Qualifications:
Age: As of the last registration date, you must be between the ages of 16 and 40.
Qualification: You must have graduated from an accredited board or at least passed the tenth grade. Higher qualifications are also accepted, such as a diploma, postgraduate degree, graduation, or 11th or 12th grade.
How to Apply:
Get the Medhavi app by visiting the Google Play Store.
Register: In the app, create an account.
Examine Notification: Examine the comprehensive notification on the scholarship examination.
Sign up to Take the Test: Finish the app's registration process.
Examine: The Medhavi app allows you to take the exam from the comfort of your home.
Get Results: In just two days, the results are made public.
Verification of Documents: Provide the required paperwork and bank account information for validation.
Get Scholarship: Following a successful verification process, the scholarship will be given. You need to have at least passed the 10th grade/matriculation scholarship amount will be transferred directly to your bank account.
Scholarship Details:
Type A: For candidates scoring 60% or above in the exam.
Type B: For candidates scoring between 50% and 60%.
Type C: For candidates scoring between 40% and 50%.
Cash Scholarship:
Scholarships can range from Rs. 2,000 to Rs. 18,000 per month, depending on the marks obtained and the type of scholarship exam (SAKSHAM, SWABHIMAN, SAMADHAN, etc.).
Since you already have a 12th grade qualification with 84%, you meet the qualification criteria and are eligible to apply for the Medhavi Scholarship exam. Make sure to prepare well for the exam to maximize your chances of receiving a higher scholarship.
Hope you find this useful!
hello mahima,
If you have uploaded screenshot of your 12th board result taken from CBSE official website,there won,t be a problem with that.If the screenshot that you have uploaded is clear and legible. It should display your name, roll number, marks obtained, and any other relevant details in a readable forma.ALSO, the screenshot clearly show it is from the official CBSE results portal.
hope this helps.
Hello Akash,
If you are looking for important questions of class 12th then I would like to suggest you to go with previous year questions of that particular board. You can go with last 5-10 years of PYQs so and after going through all the questions you will have a clear idea about the type and level of questions that are being asked and it will help you to boost your class 12th board preparation.
You can get the Previous Year Questions (PYQs) on the official website of the respective board.
I hope this answer helps you. If you have more queries then feel free to share your questions with us we will be happy to assist you.
Thank you and wishing you all the best for your bright future.
As per latest 2024 syllabus. Physics formulas, equations, & laws of class 11 & 12th chapters
As per latest 2024 syllabus. Chemistry formulas, equations, & laws of class 11 & 12th chapters
Accepted by more than 11,000 universities in over 150 countries worldwide
Register now for PTE & Unlock 20% OFF : Use promo code: 'C360SPL20'. Valid till 31st DEC'24! Trusted by 3,500+ universities globally
As per latest 2024 syllabus. Study 40% syllabus and score upto 100% marks in JEE
As per latest 2024 syllabus. Maths formulas, equations, & theorems of class 11 & 12th chapters