NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction
NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction - This chapter is one of the scoring chapters in Class 10 Science. NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction will help you understand all the interesting questions related to reflections and different types of lenses, mirrors, etc. Light Reflection and Refraction Class 10 NCERT Science solutions provides proper solutions to the questions given in the NCERT books for Class 10 Science. Class 10 Science Chapter 10 NCERT solutions will also give an insight into the proper answer writing skills, to score well in the board exams.
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- Light Reflection and Refraction Class 10 NCERT Chapter Notes
NCERT Solutions For Class 10 Science Chapter 10 Light Reflection and Refraction
Topic 10.2 Spherical Mirrors
Q.1 Define the principal focus of a concave mirror.
Answer:
It is the point on the principal axis where a beam of light parallel to the principal axis after reflection actually meets.
F represents the focal length
Q.2 The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
Answer:
So,
Hence the Focal length of the spherical mirror is 10 cm.
Q.3 Name a mirror that can give an erect and enlarged image of an object.
Answer:
Convex mirror usually gives a virtual and erect image.
The concave mirror gives a virtual and enlarged image only when the object is between pole and focus.
Q.4 Why do we prefer a convex mirror as a rear-view mirror in vehicles?
Answer :
Convex mirrors are preferred as a rearview mirror in vehicles as:
i) It forms an erect (Rigidly upright or straight.) image of an object hence object becomes easily identified.
ii) It forms a diminished image of the object thus increases the field of vision.
iii) An object that is far away from us is seen closer which helps us to take early decisions while driving.
CBSE NCERT Solutions for Class 10 Science Chapter 10 Light
Topic 10.2.4 Mirror forumula and magnification
Q.1 Find the focal length of a convex mirror whose radius of curvature is 32 cm .
Answer:
As we know for the convex mirror,
Radius (R) = Focus (f) X 2
So,
putting the given values,
Hence Focus of the convex mirror is 15 cm.
Answer:
Here Given Magnification:
m= -3 (real image)
The object distance :
u =-10cm
Now As we know,
Hence,
The image is 30 cm in front of the mirror.
NCERT Textbook Solutions for Light Class 10 Science Chapter
Topic 10.3 Refraction of light
Answer:
As we know that when the light goes from rare medium to denser medium the light bends towards the normal. So when the light goes from air to water it will bend toward the normal.
Answer:
As we know, from the definition of the refractive index that
Refractive Index :
Where = Velocity of light in the medium and
= Speed of light in vacuum
So putting those given values we get,
Hence the speed of the light in the glass is .
Material Medium | Refractive Index | Material Medium | Refractive Index |
Air Ice water Alcohol Kerosene Fused Quartz Turpentine oil Benzene Crown Glass | 1.0003 1.31 1.33 1.36 1.44 1.46 1.47 1.50 1.52 | Canada Balsam Rock Salt Carbon-Disulphide Dense Flint Glass Ruby Sapphire Diamond | 1.53 1.54 1.63 1.65 1.71 1.77 2.42 |
Answer :
As we know optical density is the tendency to hold(absorb) the light. So,
more refractive index = more absorbing power = more optical density.
It can be observed from table 10.3 that diamond and air respectively have the highest and lowest refractive index. Therefore, diamond has the highest optical density and air has the lowest optical density.
Material Medium | Refractive Index | Material Medium | Refractive Index |
Air Ice water Alcohol Kerosene Fused Quartz Turpentine oil Benzene Crown Glass | 1.0003 1.31 1.33 1.36 1.44 1.46 1.47 1.50 1.52 | Canada Balsam Rock Salt Carbon-Disulphide Dense Flint Glass Ruby Sapphire Diamond | 1.53 1.54 1.63 1.65 1.71 1.77 2.42 |
Answer:
As we can see from the table:
Refractive index of kerosene = 1.44
Refractive index of terbutaline = 1.47
Refractive index of water = 1.33
We know from the definition of refractive index, that the speed of light is higher in a medium with the lower refractive index.
So, the light travels fastest in water relative to kerosene and turpentine.
speed of light---> water > kerosene > turpentine
Q.5 The refractive index of diamond is 2.42. What is the meaning of this statement?
Answer:
Refractive Index shows the comparison of light speeds in two mediums. Light may travel from rarer to denser medium or from denser to rarer medium. When we say the refractive index of diamond is 2.42, it means light is traveling from rarer to a denser medium, and the speed of light in the air (vacuum) is 2.42 times the speed of light in a diamond. On the other hand, if the light travels from denser to rarer medium, that is, from diamond to air the refractive index will be the reciprocal of 2.42.
Topic 10.3.8 Power of Lenses
Q.1 Define 1 dioptre of power of a lens.
Answer:
A lens whose focal length is 1 metre is said to have the power of 1 dioptre.
Answer:
Since the image formed by the lens is real and inverted it is formed on the side opposite to the one where the object is placed.
Image position v = 50 cm
Let the object position be u.
Since image formed is inverted and the size image is equal to the size of the object, magnification (m) = -1.
The needle is placed 50 cm in front of the lens
Using lens formula we have
Power of the lens P is given by
The power of the lens P is 4 Dioptre.
Q.3 Find the power of a concave lens of focal length 2 m.
Answer:
The focal length of the lens is f = -2 m. (The focal length of a concave lens is negative)
Power of the lens P is given by
The Power of the lens is - 0.5 Dioptre.
NCERT Class 10 Science Chapter 10 Light Reflection and Refraction: Exercise Solutions
Q1. Which one of the following materials cannot be used to make a lens?
(a) Water (b) Glass (c) Plastic (d) Clay
Answer:
Clay cannot be used to make a lens.
(d) is the correct answer.
(a) Between the principal focus and the centre of curvature
(b) At the centre of curvature
(c) Beyond the centre of curvature
(d) Between the pole of the mirror and its principal focus.
Answer:
The position of the object should be between the pole of the mirror and its principal focus.
(d) is the correct answer.
(a) At the principal focus of the lens
(b) At twice the focal length
(c) At infinity
(d) Between the optical centre of the lens and its principal focus.
Answer:
An object should be placed at twice the focal length in front of a convex lens to get a real image of the size of the object
(b) is the correct answer.
Q 4 . A spherical mirror and a thin spherical lens have each a focal length of –15 cm. The mirror and the lens are likely to be
(a) both concave.
(b) both convex.
(c) the mirror is concave and the lens is convex.
(d) the mirror is convex, but the lens is concave.
Answer:
The mirror and the lens are both concave.
(a) is the correct answer.
Q 5. No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be
(a) only plane.
(b) only concave.
(c) only convex.
(d) either plane or convex.
Answer:
The mirror is likely to be either plane or convex.
(d) is the correct answer.
(a) A convex lens of focal length 50 cm.
(b) A concave lens of focal length 50 cm.
(c) A convex lens of focal length 5 cm.
(d) A concave lens of focal length 5 cm.
Answer:
I would prefer to use a convex lens of focal length 5 cm while reading small letters found in a dictionary because a convex lens gives magnified image if the object is in between focus and radius of curvature and the magnification will be high for shorter focal length
(c) is the correct answer.
Answer:
For the image to be erect it has to be virtual and therefore as per convention v has to be positive
v > 0
u < 0
f < 0
fu > 0
u - f > 0
u > f
Therefore the object must be placed between the pole and focus of the mirror.
i.e -15 cm < u < 0
The image formed would be virtual and larger than the object.
Q 8.(a) Name the type of mirror used in the following situations.
- Headlights of a car.
Support your answer with reason.
Answer:
A concave mirror is used for headlights of a car as they can produce parallel beams of high intensity which can travel through large distances if the source of light is placed at the focus of the mirror.
Q 8.b) Name the type of mirror used in the following situations.
- Side/rear-view mirror of a vehicle
Support your answer with reason.
Answer:
The convex mirror would be used as a side/rear-view mirror of a vehicle as the image produced will be erect, virtual and diminished. A convex mirror also has a larger field of view as compared to a plane mirror of the same size.
Q 8.c) Name the type of mirror used in the following situations.
- Solar furnace.
Support your answer with reason.
Answer:
The concave mirror would be used in a solar furnace to concentrate the incident rays from the sun on a solar panel.
Answer:
The lens would produce a complete image. Only the brightness of the image would be diminished.
Verification by experiment:
Apparatus required: a convex lens, a screen, and a candlelight
procedure:
1. Place screen behind a lens placed vertically
2. Move the candle to obtain a clear full-length image of a candle on the screen
3. Cover half of the lens with the black paper without disturbing the position of the lens
4. Note the observations
Observation: Size of the image is the same but the brightness reduces
Answer:
Object distance u = -25 cm.
Focal length = 10 cm
Let image distance be v
The position of the image is 16.66 cm on the other side of the lens.
Object size O = 5 cm.
Let the image size be I
Magnification is m
The nature of the image is real and its size is -3.33 cm.
The formation of the image is shown in the following ray diagram
Answer:
Focal length, f = -15 cm
Image distance, v = -10 cm ( As in case of the concave lens image is formed on the same side as the object is placed)
Let the object distance be u.
As per the lens formula
The object is placed at a distance of 30 cm from the lens.
Answer:
Object distance, u = -10 cm
Focal length, f = 15 cm
Let the image distance be v
As per the mirror formula
The image formed is virtual, erect, diminished and is formed 6 cm behind of the mirror.
Q 13. The magnification produced by a plane mirror is +1. What does this mean?
Answer:
It means the image formed is virtual, erect and of the same size as the object.
Answer:
Radius of curvature, R = 30 cm
Focal length, f = R/2 = 15 cm
Object distance, u = -20 cm
Let the image distance be v
Since v is positive image is formed behind the mirror.
Object size = 5 cm
A virtual, erect and diminished image of size 2.14 cm would be formed 8.57 cm behind the mirror.
Answer:
Object distance, u = -27 cm
Focal length, f = -18 cm
Let the image distance be v
As per the mirror formula
The negative sign shows the image is formed in front of the mirror and is real.
Object size = 7 cm
A real, inverted and magnified image of size 14 cm is formed in front of the mirror.
Q 16. Find the focal length of a lens of power – 2.0 D. What type of lens is this?
Answer:
The lens is concave because it's focal length is negative and is equal to -50 cm.
Answer:
The less is convex because its focal length is positive and therefore is converging.
NCERT Solutions for Class 10 for other subjects
NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction Important Topics
While preparing this chapter, it is important to know some of the important topics which requires more attention. Here are some of the important topics which you need to study before practising the NCERT Class 10 Science solutions chapter 10.
10.1 Reflection of Light
10.2 Spherical Mirrors
10.2.1 Image Formation by Spherical Mirrors
10.2.2 Representation of Images Formed by Spherical Mirrors Using ray Diagrams
10.2.3 Sign Convention for Reflection by Spherical Mirrors
10.2.4 Mirror Formula and Magnification
10.3 Reflection of Light
10.3.1 Reflection through a Rectangular Glass Slab
10.3.2 The Refractive Index
10.3.3 Reflection by Spherical Lenses
10.3.4 Image Formation by Lenses
10.3.5 Image Formation in Lenses using Ray Diagrams
10.3.6 Sign Convention for Spherical Lenses
10.3.7 Lenses Formula and Magnification
10.3.8 Power of a lens
Benefits NCERT solutions for class 10 science chapter 10 Light Reflection and Refraction
These Class 10 Science Chapter 10 NCERT solutions are easy to understand.
NCERT solutions for class 10 Science chapter 10 can help you to score well in the CBSE board exam for Class 10 Science.
You can find exercise questions and additional exercise questions in the NCERT Class 10 Science solutions chapter 10.
Step-wise step NCERT Solutions for Class 10 Science chapter 10 are provided by the experts if you have any doubt, you can ask them directly.
NCERT solutions for Class 10 Science Chapter 10 PDF download is not available. But you can download the webpage to practice the questions offline.
Chapter-wise NCERT Solutions for Class 10 Science
Chapter No. | Chapter Name |
Chapter 1 | |
Chapter 2 | |
Chapter 3 | |
Chapter 4 | |
Chapter 5 | |
Chapter 6 | |
Chapter 7 | |
Chapter 8 | |
Chapter 9 | |
Chapter 10 | Light Reflection and Refraction |
Chapter 11 | |
Chapter 12 | |
Chapter 13 | |
Chapter 14 | |
Chapter 15 | |
Chapter 16 |
How to use NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction
Firstly, it is essential to know the complete syllabus and clear all your concepts related to the given chapter.
Afterwards, practice the questions on your own. If you find it difficult to solve, then take help from the Light Reflection And Refraction Class 10 Science solutions.
Practice from previous year question papers or sample question papers to have look at what type of questions were asked previously.
Frequently Asked Question (FAQs) - NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction
Question: What are the important topics of Class 10 Science Chapter 10 Light Reflection and Refraction?
Answer:
Centre of Curvature, Principal Axis, Principal Focus, Focal Length, Images Formed by Spherical Mirrors, Mirror formula & Magnification, Refractive index, Refraction & Laws of refraction, Lens Formula & Magnification, Power of a lens.
Question: How can I get the PDF of NCERT solutions for Class 10 Chapter 10 pdf?
Answer:
NCERT solutions class 10 Science chapter 10 pdf download button available. By downloading you can save the webpage to check solutions offline.
Question: What is the weightage of Chapter 10 Light Reflection and Refraction in CBSE class 10 board final exam?
Answer:
6-7 marks. All the formulas and raydiagrams of the chapter are important. To get more problems of Light Reflection and Refraction refer to CBSE previous year papers, NCERT book and NCERT exemplar for Class 10.
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Questions related to CBSE Class 10th
my sons dob is 13/02/2009 is hi eligible for 10th board exam in 2024,,from cbse. olz reply me
The eligibility age criteria for class 10th CBSE is 14 years of age. Since your son will be 15 years of age in 2024, he will be eligible to give the exam.
can Hindi marks be replace with IT 402(additional subject) in CBSE class 10th board
That totally depends on what you are aiming for. The replacement of marks of additional subjects and the main subject is not like you will get the marks of IT on your Hindi section. It runs like when you calculate your total percentage you have got, you can replace your lowest marks of the main subjects from the marks of the additional subject since CBSE schools goes for the best five marks for the calculation of final percentage of the students.
However, for the admission procedures in different schools after 10th, it depends on the schools to consider the percentage of main five subjects or the best five subjects to admit the student in their schools.
i got less marks in maths can it get replaced by additional hindi in cbse
Replacement of marks of additional subjects and your main course subject is not like they will swap the marks you got in Hindi and Mathematics on your marksheet. It works like if you calculate the total percentage you got in your class, you can take the marks of your additional subject to consider in place of the subject you have got the least marks in. CBSE schools consider this method only to release the merit list of their students.
If you're in 10th and aiming to get admission in 11th in any school, it depends on the schools if they consider your main five subject marks or the best five subject marks for the admission.
If you're in 12th and are trying for different colleges to get in, it depends on your course which you wish to study further and also some criterias and eligibility of the colleges. In most cases for general courses, colleges take the best three or best four subjects marks consideration for the admission process.
So, good luck.
when will cbse term 2 result will declare please tale
Hello,
Central Board of Secondary Education will declare term 2 CBSE exam result 2022 for Class 10 in the third week of July. Please keep an eye on the official website or the link below for the latest information. Students need to enter their CBSE board roll number and other details to check term 2 cbseresults.nic.in 2022 Class 10 results. The board had announced the CBSE Class 10 results 2022 for term 1 on March 11, 2022.
cbse 10 claas bord result check now
Hello Aspirant,
Class 10 cbse results are not out yet. It is expected to be declared on 23rd of July. Keep checking the official website of cbse.
Good luck.