# Class 10 Science Chapter 10 Light-Reflection and Refraction

Class 10 Science Chapter 10 Light-Reflection and Refraction The answer to each chapter is provided in the list so that you can easily browse throughout different chapters NCERT Class 10 Science Chapter 10 Light-Reflection and Refraction and select need one.

## Class 10 Science Chapter 10 Light-Reflection and Refraction

Also, you can read the SCERT book online in these sections Solutions by Expert Teachers as per SCERT (CBSE) Book guidelines. These solutions are part of SCERT All Subject Solutions. Here we have given Assam Board Class 10 Science Chapter 10 Light-Reflection and Refraction Solutions for All Subjects, You can practice these here…

### Light-Reflection and Refraction

Chapter – 10

GENERAL SCIENCE

Q.1. Which one of the following materials cannot be used to make a lens ?

( a ) Water.

( b ) Glass.

( c ) Plastic.

( d ) Clay.

Ans :- ( d ) Clay.

Q.2. The image formed by a concave mirror is observed to the 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 .

Ans :- ( d ) Between the pole of the mirror and its principal focus .

Q.3. Where should an object be placed in front of a convex lens to get a real image of the size of the object?

( 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 .

Ans :- ( b ) At twice the focal length .

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 concve .

Ans :- ( a ) Both concave .

Q.5. 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 .

Ans :- ( d ) Either plane or convex .

Q.6. Which of the following lenses would you prefer to use To which 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 of 5 cm .

( d ) A concave lens of focal length of 5 cm .

Ans :- ( c ) A convex lens of focal length of 5 cm .

Q.7. 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 The smaller than the object ? Draw a ray diagram to show the image formation in this case .

Ans :- The object should be placed between the focus F and the pole P of the concave mirror . That is between 0 and 15 cm from the mirror .

The image will be virtual , erect and larger than the object .

Q.8. Name the type of mirror used is the following situations :

( a ) Head lights of a car .

( b ) Side / rear – view mirror of a vehicle .

Ans :- ( a ) A concave mirror is used in the headlights of a car . This is because when , a lighted bulb is placed at the focus of the concave reflector , then the concave reflector produces a powerful beam of parallel light rays. This beam of light helps us to see things up to a considerable distance in the darkness of night .

( b ) A convex mirror is used as a side / rear – view mirror of a vehicle because a convex mirror always forms an erect , virtual and diminished image of an object placed any where in front of it and a convex mirror has a wider field of view than a plane mirror of the same size .

( c ) Large concave mirrors are used to concentrate sunlight to produce heat in solar furnaces .

Q.9. 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 .

Ans :- When the lower half the convex lens is covered with a black paper , it still forms the complete image of the object as that with uncovered lens .

But the intensity of the image is reduced when one half of the convex lens of covered with a black paper .

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