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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 power $1.5 P$ is:

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a

$2 R$

b

$\frac{R}{2}$

c

$\frac{3 R}{2}$

d

$\frac{R}{3}$

answer is D.

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Detailed Solution

detailed_solution_thumbnail

Using lens maker’s formula

$\frac{1}{f} = (μ - 1) (\frac{1}{R_{1}} - \frac{1}{R_{2}})$

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