Q.

A double convex lens is made of glass of refractive index 1.5. If its focal length is 30 cm, then radius of curvature of each of its curved surface is

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a

10 cm

b

15 cm

c

18 cm

d

30 cm

answer is D.

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Detailed Solution

f=R2(μ−1)⇒30=R2(1.5−1)⇒R=30cm
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A double convex lens is made of glass of refractive index 1.5. If its focal length is 30 cm, then radius of curvature of each of its curved surface is