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$\begingroup$ If we consider slab thicker than what will be the path traced by rays inside the slab. I think they will not travel in straight line but will bend upward but is there any equation through which we can determine the trajectory of light rays inside the slab. $\endgroup$
– Govind Prajapat
Commented Mar 12 at 9:50
$\begingroup$ «trajectory of light rays inside the slab» @Govind Prajapat, The ray paths inside a thick plate with a linear gradient of refractive index will rotate simultaneously with the flat front as it propagates from O1O2 to A1A2 and further to P1P2 (the rays are perpendicular to the wavefront). The rotation of this flat front at time T is described by the uppermost formula tg(α)= TC(1/n1−1/n2)/h $\endgroup$
– Ванек Огонек
Commented Mar 12 at 12:36

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