Question

A light ray enters a rectangular glass slab from air. At the first surface of refraction, $i$ is the angle of incidence and $r$ is the angle of refraction. Which of the following statements is correct?

• A. $r=i$
• B. $r<i$
• C. $r>i$
• D. Cannot be determined

Answer 1

The correct option is B

$r<i$

When light is incident obliquely from a medium of lower optical density to that of greater optical density, the refracted ray bends towards the normal. Therefore, in the case of refraction of light in a rectangular glass slab, if $i$ is the angle of incidence and $r$ is the angle of refraction, then $i>r$.