Question

A student traces the path of a ray of light passing through a rectangular glass slab.



For measuring the angle of incidence, he must position the protractor in the manner shown in figure:
(1) A
(2) B
(3) C
(4) D

Answer 1

The angle of incidence is the angle formed by the incident ray and the normal to the slab. So, only in figure B, the correct measurement of the angle of incidence has been shown.

Hence, the correct answer is option 2.