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Chapters
2: Acids, Bases and Salts
3: Metals and Non-metals
4: Carbon and its Compounds
5: Periodic Classification of Elements
6: Life Processes
7: Control and Coordination
8: How do Organisms Reproduce
9: Heredity and Evolution
▶ 10: Light - Reflection and Refraction
11: Human Eye and Colourful World
12: Electricity
13: Magnetic Effects of Electric Current
14: Sources of Energy
15: Our Environment
16: Management of Natural Resources
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Solutions for Chapter 10: Light - Reflection and Refraction
Below listed, you can find solutions for Chapter 10 of CBSE, Karnataka Board NCERT for साइंस [अंग्रेजी] कक्षा १०.
NCERT solutions for साइंस [अंग्रेजी] कक्षा १० 10 Light - Reflection and Refraction Intext Questions 1 [Page 168]
Define the principal focus of a concave mirror.
The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
Name the mirror that can give an erect and enlarged image of an object.
Why do we prefer a convex mirror as a rear-view mirror in vehicles?
NCERT solutions for साइंस [अंग्रेजी] कक्षा १० 10 Light - Reflection and Refraction Intext Questions 2 [Page 171]
Find the focal length of a convex mirror whose radius of curvature is 32 cm.
A concave mirror produces three times magnified (enlarged) real image of object placed at 10 cm in front of it. Where is the image located?
NCERT solutions for साइंस [अंग्रेजी] कक्षा १० 10 Light - Reflection and Refraction Intext Questions 3 [Page 176]
A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m s−1.
Find out, from Table, the medium having highest optical density. Also find the medium with lowest optical density.
| Material medium | Refractive index | Material medium | Refractive index |
| Air | 1.0003 | Canada Balsam | 1.53 |
| Ice | 1.31 | – | – |
| Water | 1.33 | Rock salt | 1.54 |
| Alcohol | 1.36 | – | – |
| Kerosene | 1.44 | Carbon disulphide | 1.63 |
| Fused quartz | 1.46 | Dense flint glass | 1.65 |
| Turpentine oil | 1.47 | Ruby | 1.71 |
| Benzene | 1.50 | Sapphire | 1.77 |
| Crown glass | 1.52 | Diamond | .42 |
You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table.
| Material medium |
Refractive index | Material medium | Refractive index |
| Air | 1.0003 | Canada Balsam | 1.53 |
| Ice | 1.31 | – | – |
| Water | 1.33 | Rock salt | 1.54 |
| Alcohol | 1.36 | – | – |
| Kerosene | 1.44 | Carbon disulphide | 1.63 |
| Fused quartz |
1.46 | Dense flint glass |
1.65 |
| Turpentine oil | 1.47 | Ruby | 1.71 |
| Benzene | 1.50 | Sapphire | 1.77 |
| Crown glass |
1.52 | Diamond | 2.42 |
The refractive index of diamond is 2.42. What is the meaning of this statement?
NCERT solutions for साइंस [अंग्रेजी] कक्षा १० 10 Light - Reflection and Refraction Intext Questions 4 [Page 184]
Define 1 dioptre of power of a lens.
A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is equal to the size of the object? Also, find the power of the lens.
Find the power of a concave lens of focal length 2m.
NCERT solutions for साइंस [अंग्रेजी] कक्षा १० 10 Light - Reflection and Refraction Exercises [Pages 185 - 186]
Which one of the following materials cannot be used to make a lens?
Water
Glass
Plastic
Clay
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
Between the principal focus and the centre of curvature
At the centre of curvature
Beyond the centre of curvature
Between the pole of the mirror and its principal focus.
Where should an object be placed in front of a convex lens to get a real image of the size of the object?
At the principal focus of the lens
At twice the focal length
At infinity
Between the optical centre of the lens and its principal focus
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 ______.
both concave
both convex
the mirror is concave and the lens is convex
the mirror is convex, but the lens is concave
No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be ______.
Plane
Concave
Convex
Either plane or convex
Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
A convex lens of focal length 50 cm.
A concave lens of focal length 50 cm.
A convex lens of focal length 5 cm.
A concave lens of focal length 5 cm.
We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.
Name the type of mirror used in the following situation:
Headlights of a car
Support your answer with reason.
Name the type of mirror used in the following situation:
Side/rear-view mirror of a vehicle
Support your answer with reason.
Name the type of mirror used in the following situation:
Solar furnace
Support your answer with reason.
One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally. Explain your observations.
An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.
A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.
An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.
What is the magnification of the images formed by plane mirrors and why?
An object 5 cm is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position, nature and size of the image.
An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focused image can be obtained? Find the size and the nature of the image.
Find the focal length of a lens of power −2.0 D. What type of lens is this?
A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
Solutions for 10: Light - Reflection and Refraction
NCERT solutions for साइंस [अंग्रेजी] कक्षा १० chapter 10 - Light - Reflection and Refraction
Shaalaa.com has the CBSE, Karnataka Board Mathematics साइंस [अंग्रेजी] कक्षा १० CBSE, Karnataka Board solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. NCERT solutions for Mathematics साइंस [अंग्रेजी] कक्षा १० CBSE, Karnataka Board 10 (Light - Reflection and Refraction) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. NCERT textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.
Concepts covered in साइंस [अंग्रेजी] कक्षा १० chapter 10 Light - Reflection and Refraction are Light and Its Straight-Line Propagation, Reflection of Light, Spherical Mirrors, Image Formation by Spherical Mirrors, Representation of Images Formed by Spherical Mirrors, Sign Convention for Reflection by Spherical Mirrors, Ray Optics - Mirror Formula, Refraction of Light, Refraction through a Rectangular Glass Slab, The Refractive Index, Refraction by Spherical Lenses, Image Formation by Lenses, Image Formation in Lenses Using Ray Diagrams, Sign Convention for Spherical Lenses, Lens Formula, Power of a Lens, Image Formation by Concave Mirror, Image Formation by a Convex Mirror, Light and Its Straight-Line Propagation, Reflection of Light, Spherical Mirrors, Image Formation by Spherical Mirrors, Representation of Images Formed by Spherical Mirrors, Sign Convention for Reflection by Spherical Mirrors, Ray Optics - Mirror Formula, Refraction of Light, Refraction through a Rectangular Glass Slab, The Refractive Index, Refraction by Spherical Lenses, Image Formation by Lenses, Image Formation in Lenses Using Ray Diagrams, Sign Convention for Spherical Lenses, Lens Formula, Power of a Lens, Image Formation by Concave Mirror, Image Formation by a Convex Mirror, Light and Its Straight-Line Propagation, Reflection of Light, Spherical Mirrors, Image Formation by Spherical Mirrors, Representation of Images Formed by Spherical Mirrors, Sign Convention for Reflection by Spherical Mirrors, Ray Optics - Mirror Formula, Refraction of Light, Refraction through a Rectangular Glass Slab, The Refractive Index, Refraction by Spherical Lenses, Image Formation by Lenses, Image Formation in Lenses Using Ray Diagrams, Sign Convention for Spherical Lenses, Lens Formula, Power of a Lens, Image Formation by Concave Mirror, Image Formation by a Convex Mirror.
Using NCERT साइंस [अंग्रेजी] कक्षा १० solutions Light - Reflection and Refraction exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in NCERT Solutions are essential questions that can be asked in the final exam. Maximum CBSE, Karnataka Board साइंस [अंग्रेजी] कक्षा १० students prefer NCERT Textbook Solutions to score more in exams.
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