Question

एक उत्तल लेंस की फोकस दूरी 40 सेंटीमीटर है लेंस की छमता की गणना कीजिए​

Answer 1

Answer:

Power of lense

P = 1/f

Where f is in meter

P = 1/0.40 = 2.5 Diopter

Answer 2

Answer:

Power = 1/focal length = 1/0.04 = 25 D

Explanation:

Convex lens is a spherical refracting lens which is wider in the middle and narrow at the edges.

Images formed through convex lens are real as well as virtual.

It converges the light rays incident on the lens.

Power of a convex lens is the measure of converging degree of the lens.

Power is reciprocal of focal length of lens.

Convex lens has positive power because the focal length is positive.

Power = 1/focal length = 1/0.04 = 25 D.

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