Question

What is the power of a lens if its focal length is 50cm? ​

Answer 1

Answer:

Power of a lens is always reciprocal to the focal length. So, aconvex lens with 50cm focal length has a power of (1/0.5) Dioptre(D) or 2D

Explanation:

Answer 2

f=1/2 m

power of lens :— 1/focal length

P= 2 D

Power is negative for concave and positive for convex lens. Si Unit of power of lens Is Dioptre

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