Question

What is meant by power of lens . What does its sign (+ve or -ve ) indicate . State its S.I. unit . How is this unit related to focal length of the lens .

Answer 1

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A measure of degree of convergence or divergence of a light rays falling on it is called power of lens.
- A power of convex lens is positive.
- A power of concave lens is negative.
SI unit of power of a lens is Dioptre.

Dioptre unit related to focal length of the lens is
P= 1/f
Where,
P= Power of lens
f= focal length of lens

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