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 $n_1$ to $n_2$ over the height $h$. Which of the following statement(s) is(are) true about the light wave emerging out of the slab?
Select ALL correct options:
A
It will deflect up by an angle $\tan ^{-1}\left[\frac{\left(n_2^2-n_1^2\right) d}{2 h}\right]$
B
It will deflect up by an angle $\tan ^{-1}\left[\frac{\left(n_2-n_1\right) d}{h}\right]$
C
It will not deflect.
D
The deflection angle depends only on ( $\mathrm{n}_2-\mathrm{n}_1$ ) and not on the individual values of $\mathrm{n}_1$ and $\mathrm{n}_2$.
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