Question

Assertion (A): The power of a lens is its ability to bend light- the greater 1
the power, greater is the
refraction of light.
Reason ( R): The power of a convex lens is negative.



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Answer 1

Explanation:

The ability of a lens to bend the light rays is called power of lens.

A convex lens converge the light rays towards the principal axis whereas a concave lens diverges the light rays away from the principal axis. In this way a lens bends the light rays. A lens of shorter focal length bends the light ray more, and have greater power. Thus power of a lens is defined as the reciprocal of its focal length (f) in metres.

Power of lens P=

f(in meters)

1

Unit of power of lens is 'metre' and its S.I. unit is 'dioptre' which is denoted by

′

D

′

.

The power of a convex lens a positive and that of a concave lens is negative

Answer 2

Answer:

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