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$\begingroup$ What if we don't consider slab infinitesimal thin, as it is not mentioned in question? wouldn't ray start deviating in the slab itsef? $\endgroup$
– Govind Prajapat
Commented Mar 7 at 18:23
$\begingroup$ The thinner the slab, the smaller the deviation angle. It's not the ray that's deviating it's the wavefront. Each individual ray in the wavefront is traveling at different speeds through the medium causing the wavefront to change angle $\endgroup$
– Stevan V. Saban
Commented Mar 7 at 18:32

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