30 A transparent rectangular slab of length 1 20 cm and

Last updated: 6/11/2023

30 A transparent rectangular slab of length 1 20 cm and thickness d cm is placed in front of a converging lens of focal length f 20 cm screen S is placed in the focal plane of the lens Refractive index of material of the slab increases linearly from 40 1 5 at the bottom f by an amount du 2 0 x 10 4 between the bottom and the top faces parallel beam is made to incident on the slab as shown in the figu What kind of light pattern appears on the screen