The image of an object, formed by a plano-convex lens at a distance of 8m behind the lens, is real and is one third the size of the object. The wavelength of light inside the lens is 2/3 times the wavelength in free space. The radius of the curved surface of the lens is
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Correct option is d) 3m
Explaination::
\(\mu ={\lambda_0\over \lambda_m}={3\over2}\)
\({1\over f}={(\mu-1)\over R}={1\over 2R}\)
\({1\over f}={1\over V}-{1\over u}\)
\({1\over8}-({1\over24})={1\over2R}\)
\({3+1\over24}={1\over2R}\)
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