Question

The radii of curveture of two surface of a lens are 0.20 m and 0.30 m respectively. The refractive index is 1.5 . find the focal length of lens if it is (a) double convex ( b) double concave ( c) concavo convex
( d) convexo concave
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Answer 1

Answer:

[D]

Explanation:

convexo concave