Chapters
Chapter 2: Acids, Bases and Salts
Chapter 3: Metals and Non-metals
Chapter 4: Carbon and its Compounds
Chapter 5: Periodic Classification of Elements
Chapter 6: Life Processes
Chapter 7: Control and Coordination
Chapter 8: How do Organisms Reproduce
Chapter 9: Heredity and Evolution
Chapter 10: Light - Reflection and Refraction
Chapter 11: Human Eye and Colourful World
Chapter 12: Electricity
Chapter 13: Magnetic Effects of Electric Current
Chapter 14: Sources of Energy
Chapter 15: Our Environment
Chapter 16: Management of Natural Resources
Chapter 10: Light - Reflection and Refraction
Chapter 10: Light - Reflection and Refraction solutions [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?
Chapter 10: Light - Reflection and Refraction solutions [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?
Chapter 10: Light - Reflection and Refraction solutions [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 | 2.42 |
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?
Chapter 10: Light - Reflection and Refraction solutions [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 2 m.
Chapter 10: Light - Reflection and Refraction solutions [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?
(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.
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
(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
No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be
(a) plane
(b) concave
(c) convex
(d) either plane or convex
Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
(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
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 situations.
(a) Headlights of a car
(b) Side/rear-view mirror of a vehicle
(c) 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 aconvex 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?
Chapter 10: Light - Reflection and Refraction
Textbook solutions for Class 10
NCERT solutions for Class 10 Science chapter 10 - Light - Reflection and Refraction
NCERT solutions for Class 10 Science chapter 10 (Light - Reflection and Refraction) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CBSE Science Textbook for Class 10 solutions in a manner that help students grasp basic concepts better and faster.
Further, we at shaalaa.com are providing such solutions so that students can prepare for written exams. NCERT textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.
Concepts covered in Class 10 Science chapter 10 Light - Reflection and Refraction are Some Natural Phenomena Due to Sunlight, Atmospheric Refraction, Dispersion by a Prism, Applications of Spherical Mirrors and Lenses, Defects of Vision and Their Correction, Concept of Human Eye, Power of a Lens, Spherical Mirrors, Image Formation by Spherical Mirrors - Concave Mirror, Representation of Images Formed by Spherical Mirrors Using Ray Diagrams - Concave Mirror, Mirror Formula and Magnification, Velocity of Light, Sign Convention for Reflection by Spherical Mirrors, Lens Formula and Magnification, Refraction Through a Rectangular Glass Slab, Refractive Index, Refraction by Spherical Lenses, Image Formation by Lenses - Convex Lens, Image Formation in Lenses Using Ray Diagrams - Convex Lens, Sign Convention for Spherical Lenses, Introduction, Image Formation by Spherical Mirrors - Convex Mirror, Representation of Images Formed by Spherical Mirrors Using Ray Diagrams - Convex Mirror, Image Formation by Lenses - Concave Lens, Image Formation in Lenses Using Ray Diagrams - Concave Lens, Light Reflection and Refraction Introduction.
Using NCERT Class 10 solutions Light - Reflection and Refraction exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in NCERT Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 10 prefer NCERT Textbook Solutions to score more in exam.
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