Focal length of a thin convex lens is 30 cm. At distance of 10 cm from the lens there is a plan refracting surface of refractive index `3//2`. Where w the parallel rays incident on lens converge ?
A. At a distance of 27.5 cm from the lens
B. At a distance of 25 cm from the lens
C. At a distance of 45 cm from the lens
D. At a distance of 40 cm from the lens
