KVPY SX SB Exam 19-Nov-2017 Question Paper

A light beam travelling along the x axis with planar wavefront is incident on a medium of thickness t. In the region, where light is falling the refractive index can be taken to be varying such that $\frac{\mathit{d}\mathit{n}}{\mathit{d}\mathit{y}}>0.$ The light beam on the other side of the medium will emerge