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Q.

A double convex lens of glass of μ = 1.5 has radius of curvature of each of its surface is 0.2 m. The power of the lens is

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a

+10 dioptres

b

−10 dioptres

c

−5 diontres

d

+5 dioptres

answer is D.

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Detailed Solution

f=R2(μ−1)⇒P=2(μ−1)R=2(1.5−1)0.2=+5D

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