NEET 2000 Physics question

For a plano convex lens () has radius of curvature 10 cm. It is silvered on its plane surface. Find focal length after silvering :

(1)Correct
(2)
(3)
(4)

Answer: (1)

Solution

A plano-convex lens silvered on its plane face behaves like a concave mirror. Light refracts at the curved surface, reflects from the plane silvered surface and refracts again through the curved surface. The equivalent power is . Power of the lens:

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Question ID VK-088547