Question

A monochromatic light wave is incident normally on a glass slab of thickness d, as shown in the figure. The refractive index of the slab increases linearly from n1 to n2 over the height h. Which of the following statement(s) is(are) true about the light wave emerging out of the slab?

• A. It will deflect up by an angle tan−1 $[\frac{(n^2_2-n^2_1)d}{2h}]$.
• B. It will deflect up by an angle tan−1 $[\frac{(n_2-n_1)d}{h}]$
• C. It will not deflect
• D. The deflection angle depends only on (n2-n1) and not on the individual values of n1 and n2.

Answer 1

Answer: (B), (D)

It will deflect up by an angle tan−1 $[\frac{(n_2-n_1)d}{h}]$

Answer 2

The correct options are: B and D.

It will deflect up by an angle tan−1 $[\frac{(n_2-n_1)d}{h}]$

and The deflection angle depends only on (n2-n1) and not on the individual values of n1 and n2.