# Solve this: ​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.

Dear Student,

i.

ii.

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