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Q.

A double convex lens has power P and same radii of curvature R of both the surfaces.  The radius of curvature of a surface of a plano-convex lens made of the same material with powr 1.5 P is

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a

3R2

b

2R

c

R2

d

R3

answer is D.

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Detailed Solution

Plano-Convex Lens : 1.5P=μ−1×1R'Double Convex Lens : P=μ−12R⇒R'=R3
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