Question

In an experiment on tracing the path of a ray of light through a rectangular glass slab, four students A, B, C and D used the following values of the angle of incidence and the distance between the feet of the two pins (fixed on the incident rays):
(A) 30°, 45°, 60° and 1 cm
(B) 30°, 45°, 60° and 6 cm
(C) 20°, 50°, 80° and 10 cm
(D) 20°, 50°, 80° and 15 cm
Out of these, the best choice is that of the student:
(1) A
(2) B
(3) C
(4) D

Answer 1

The best choice of angles of incidence would be 30°, 45°, and 60°, because it would be easier to perform the calculations to obtain the angle of refraction theoretically. Also, the best choice for the distance between the pins would be 6 cm, because it will provide a better line of sight for the observations through the other side of the slab.

Hence, the correct answer is option 2.