# Trace the course of a ray of ligth through a rectangular glass slab. From the plot discuss what happens when (i) ray goes from a rarer to a denser med

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Trace the course of a ray of ligth through a rectangular glass slab. From the plot discuss what happens when
(i) ray goes from a rarer to a denser medium ?
(ii) ray goes from a denser to a rarer medium?

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the course of rays through a rectangular glass slab ABCD.
Two refractions occur, one at Q and other at R. PQ is incident ray, travelling in air i_(1) is angle of incidence in air
QR is refracted ray, travelling in glass, r_1 is angle of refraction, in glass.
For second refraction at R
QR is incident ray in glass r_2 is angle of incidence in glass RS is refracted ray in air e is angle of emergence, in air.
(i) As angle r_1 lt anglei_1 , therefore, when a ray goes from a rarer medium (air) to a denser medium (glass), the ray bends towards normal.
As angle e gt angle r_2, therefore, when a ray goes from a denser to a rarer medium, it bends away from normal.