Question

What is the power of concave lens of focal length 4m?

Answer 1

0.25 will be thw power of concave lens having focal length of 4 m

Answer 2

Given that,

Focal length of the concave lens, P = 4 m

To find,

The power of concave lens.

Solution,

Let P is the power of the concave lens. Power of a lens is equal to the reciprocal of its focal length. It is given by :

$P=\dfrac{1}{f}\\\\P=\dfrac{1}{4}\ m^{-1} \\\\P=0.25\ D$

So, the power of the lens is 0.25 D.

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Power of lens

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