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Q.

Focal length of the plano - convex lens is _________ when its radius of curvature of the surface is R and n is the refractive index of the lens.

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a

$f = R$

b

$f = R / 2$

c

$f = R / (n - 1)$

d

$f = (n - 1) / R$

answer is C.

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