JEE (Advanced) 2013 Paper-1 Question 10

Question 10

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 oflight inside the lens is $$\frac{2}{3}$$ times the wavelength in free space. The radius of the curved surface of the lens is



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