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Q.

Consider an equiconvex lens of radius of curvature R and focal length f. if f > R, the refractive index µ of the material of the lens 

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a

is greater than 1.5 but less than 2.0

b

is greater than one but less than 1.5

c

none of these

d

is greater than zero but less than 1.5

answer is C.

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Detailed Solution

1f=μ−12R  or  f=R2μ−1Now,    f>R∴R2μ−1  or   12μ−1>1  or    2μ−1<1or    μ−1<12   or   μ<1+12   or  μ<1.5

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