Question

Select from the following the best experimental set-up for tracing the path of a ray of light through a glass slab:
(A) I

(B) II

(C) III

(D) IV

Answer 1

To achieve best experimental set-up for tracing the path of a ray of light through a glass slab:
the point of incidence should be in the middle of the glass slab
and the incident angle should be close to 45o
​Therefore, the experimental setup IV fulfills the above two conditions.

Hence, the correct answer is option (D).