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Question
Two prisms ABC and DBC are arranged as shown in the figure.
The critical angles for the two prisms with respect to air are 41.1° and 45° respectively. Trace the path of the ray through the combination.
Solution
The ray incident normally at M enters undeviated.
At E, the angle of incidence is 45°. It is greater than the critical angle. So, it is totally internally reflected.
At H, the ray is incident normally. So it enters prism BDC undeviated.
At F, the angle of incidence is 60°. It is greater than the critical angle. So, it is internally reflected.
At G, the ray is incident normally. So, it comes out from the prism undeviated.
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