JEE Advanced | 2013Geometrical OpticsHard
Question
The image of an object, formed by a plano-convex lens at a distance of 8 m behind the lens, is real and is one-third the size of the object. The wavelength of light inside the lens is 
times the wavelength in free space. The radius of the curved surface of the lens is :-
times the wavelength in free space. The radius of the curved surface of the lens is :-Options
A.1 m
B.2 m
C.3 m
D.6 m
Solution
Real image ⇒ v = + 8 m
for plano convex lens
R = 3 m
for plano convex lens
R = 3 m
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