Q42. (i) A ray PQ of light is incident on the face AB of a glass prism ABC (as shown in the figure ) and emerges out of the face AC. Trace the path of the ray. Show that

$\angle $i + $\angle $e = $\angle $A + $\angle $ $\delta $

where, $\delta $ and e denote the angle of deviation and angle of emergence, respectively.

Plot a graph showing the variation of the angle of deviation as a function of angle of incidence. State the condition under which $\angle $ $\delta $ is minimum.

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