A biconvex lens has radii of curvature 20 cm each. If the refractive index of the material of the lens is 1 . 5 , the power of the lens is:

Question

A biconvex lens has radii of curvature 20 cm each. If the refractive index of the material of the lens is 1 . 5 , the power of the lens is:, + 20 D, + 5 D, infinity, + 2 D

MARKS App · Accepted Answer

Power of the lens is, P = 1 f = μ - 1 1 R 1 - 1 R 2 ⇒ P = 1 . 5 - 1 1 0 . 2 - 1 - 0 . 2 = 0 . 5 × 10 ⇒ P = + 5 D

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