The image of an object formed by a plano-convex lens at a distance of 8m behind the lens, is real and one-third the size of object. The wavelength of light inside the lens is 23 times the wavelength in free space. The radius of curved surface of the lens is
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Explanation:
one-third the size of object. means that v/u = 1/3 (not hi/ho)
v = 8
λl / λa = 2/3 = v/c (as wavelength is proportional to velocity )
n = c/v = 3/2 = 1.5
-v/u = f-v / f
-1/3 = f -8 / f
f = 6
f= R/(n-1)
R = 6/2 = 3m
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