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 ?

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It will not deflect.

The deflection angle depends only on $(n_{2} - n_{1})$ and not on the individual values of $n_{1}$ and $n_{2}$ .

It will deflect up by an angle $\tan^{- 1} [\frac{(n_{2}^{2} - n_{1}^{2}) d}{2 h}]$

It will deflect up by an angle $\tan^{- 1} [\frac{(n_{2} - n_{1}) d}{h}]$

answer is B, D.

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