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Question

What is the power of Lens?


Solution

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 $$P = \dfrac {1}{f(in\ meters)}$$
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.

Physics

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