The graph between angle of deviation ( $\delta$ ) and angle of incidence (i) for a triangular prism is represented by:

JEE Main · 2013 · 07 Apr 2013 · Offline · Geometrical Optics

The graph between angle of deviation (

δ

) and angle of incidence (i) for a triangular prism is represented by:

(A)(see structure)
(B)(see structure)
✓ Correct
(C)(see structure)
(D)(see structure)

Answer: (B)

Solution

As the angle of incidence on a prism is raised from a small value, the deviation first comes down, passes through a single lowest value at the angle of minimum deviation, and then climbs again for larger incidence. The graph that captures this is a smooth curve dipping to one minimum, rather than a straight line or one that only rises.

JEE Main · 2013 · 07 Apr 2013 · Offline · Single correct option

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