NCERT Solutions Class 10 Science Chapter 10 Light Reflection And Refraction Download In Pdf

Chapter 10 Light – Reflection and Refraction Download in pdf

NCERT Solutions Intext Questions Page No.168

**Question 1.** Define the principal focus of a concave mirror.

**Question 2.** The radius of curvature of a spherical mirror is 20 cm. What is its focal
length?

**Question 3.** Name a mirror that can give an erect and enlarged image of an object.

**Question 4.** Why do we prefer a convex mirror as a rear-view mirror in vehicles?

NCERT Solutions Intext Questions Page No.171

**Question 1.** Find the focal length of a convex mirror whose radius of curvature is
32 cm.

**Question 2.** A concave mirror produces three times magnified (enlarged) real image
of an object placed at 10 cm in front of
it. Where is the image located?

NCERT Solutions Intext Questions Page No.176

**Question 1.** 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?

**Question 2.** 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.

**Question 3.** Find out, from Table 10.3, the medium having highest optical density.
Also find the medium with lowest optical density.

**Question 4.** You are given kerosene, turpentine and water. In which of these does
the light travel fastest? Use the information given in Table 10.3.

**Question 5.** The refractive index of diamond is 2.42. What is the meaning of this
statement?

NCERT Solutions Intext Questions Page No.184

**Question 1.** Define 1 dioptre of power of a lens.

**Question 2.** 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.

**Question 3.** Find the power of a concave lens of focal length 2 m.

NCERT Solutions Exercises Questions

**Question 1.** Which one of the following materials cannot be used to make a lens?
(a) Water (b) Glass (c) Plastic (d) Clay

**Question 2. **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.

**Question 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.

**Question 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.

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