The radius of curvature for a convex lens is 40 cm, for each surface. Its refra

Question

The radius of curvature for a convex lens is 40 cm, for each surface. Its refractive index is 1.5. The focal length will be
[MP PMT 1989]

Options:

A . 40 cm

B . 20 cm

C . 80 cm

D . 30 cm

Answer: Option A
:
A

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