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Question
A student traces the path of a ray of light passing through a rectangular glass slab and marks the angle of incidence i, angle of refraction r and angle of emergence e, as shown.
The correctly marked angle(s) is/are
(A) ∠ i only
(B) ∠ e only
(C) ∠ r only
(D) ∠ i and ∠ e
Solution
Angle of incidence, angle of refraction and angle of emergence, all are measured from the normal to the surface. Therefore, only angle of refraction, ∠r is marked correctly.
Hence,the correct option is C.
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