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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 ∠r ∠e
I 30° 20° 31°
II 40° 25° 40°
III 50° 31° 49°
The correct observations are: I and III and II; I and II; I, II and III; I and III

II and III

I, II and III

I and II

I and III

Solution:

Condition 1-Angle of Incidence ∠i ≈ Angle of Emergent ∠e (Experimental values) and Angle of Refraction ∠r < Angle of Incidence ∠i.
Condition 2-When Angle of Incidence ∠i increase corresponding Angle of Refraction ∠r should also increase.
In above Table, all the 3 observations are valid for the conditions.