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A planoconvex lens behaves like a concav...

A planoconvex lens behaves like a concave mirror of 30 cm focal length on silvering the plane surface of the lens, but on polishing by silver on convex surface, it acts as is concave mirror of 10 cm focal length. What will be the refractive index of the material of the lens ?

A

1

B

1.25

C

1.33

D

1.5

Text Solution

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