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Question
After tracing the path of rays of light through a glass slab for three different angles of incidence, a student measured the corresponding values angle of refraction r and angle of emergence e and recorded them in the table given below:
|
S. No. |
∠i |
∠i |
∠e |
|
I |
30° |
20° |
31° |
|
II |
40° |
25° |
40° |
|
III |
50° |
31° |
49° |
The correct observations are:
(A) I and II
(B) II and III
(C) I and III
(D) I, II and III
Solution
(D)
For light rays passing through a glass slab, the following conditions should hold true:
(1) ∠i ≈ ∠e and ∠r < ∠i
(2) Also, with the increase in incident angle, the refracted angle also increases.
Both of these conditions are satisfied in all the three observations.
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