Question

Explain the concept of power of lens.​

Answer 1

$\textbf{Power of lens :}$

» It is the reciprocal of focal length.

i.e

P = $\dfrac{1}{f}$

Here..

• P = Power of lens

• f = focal length

In meter

P = $\frac{1}{f}$

And in cm

P = $\frac{100}{f}$

› Power of convex lens is positive and power of concave lens is negative.

» S.I. Unit of power is Dioptre (D).

» 1 Dioptre is the power of lens whose focal length is 1 m.

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Answer 2

hey mate...

here is your answer...

Power of lens is the ability of the lens to converge the rays of light falling on it. It can also be defined as P=1/f where f is the focal length. Power of a lens is the reciprocal of its focal length. Dioptre is the S I unit of power of lens.

hope it helps...