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Q.

An equiconvex lens of refractive index μ2 is separating two medium of refractive index μ1 and μ3 . Then the lens

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a

is diverging for,μ2<μ1+μ3/2

b

is powerless for μ2<μ1+μ3/2

c

is converging for,μ2>μ1+μ3/2

d

is powerless for,μ2=μ1+μ3/2

answer is A, B, C.

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Detailed Solution

In this case focal length of the lens is given by 1f=2μ2-μ1-μ2μ3R

The lens will be converging if f>0, diverging if f<0 and powerless if f = 0.

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