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Power and Thin Lenses in Contact

A plano-conve...

Question

A plano-convex lens has a curved surface of radius of curvature $R$ and refractive index $μ$ . If its plane surface is silvered, then, it behaves as a :

A

Convex lens

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B

Convex mirror

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C

Concave lens

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D

Concave mirror

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Solution

The correct option is D Concave mirror
It behaves as concave mirror of focal length
$f = \frac{R}{2 (μ - 1)}$

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