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

A

1 m

B

2 m

C

3 m

D

6 m