The angle between two mirrors is 60° and is kept fixed. A ray is incident on one mirror at an angle $i$ as shown in figure. The angle $i$ is slowly increased from 0° to 90°. The net deviation suffered by the ray after two reflections is $D$ . Which of the following plots for $D$ vs $i$ is correct?

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TestHub · Accepted Answer

For two mirrors at angle θ , net deviation after two reflections is D = 36 0 ∘ − 2 θ . With θ = 6 0 ∘ , D = 24 0 ∘ , independent of i . So the plot of D versus i is a horizontal line. Ans. (C)

Physics - Geometrical Optics Question with Solution | TestHub

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