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Q.

A double convex lens R1=R2=10cm(μ=1.5) having focal length equal to the focal length of a concave mirror. The radius of curvature of the concave mirror is

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a

10 cm

b

20 cm

c

40 cm

d

15 cm

answer is B.

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Detailed Solution

1f=(μ−1)1R1−1R2 =(1.5−1)110+110=110⇒f=10cm ∴ Radius of curvature of concave mirror =2f = 20 cm.
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