Question

A ray of light is incident on a parallel-sided glass slab as shown in the figure. The angle of refraction for this ray of light is likely to be:



(1) 60°
(2) 33°
(3) 57°
(4) 30°

Answer 1

In the given figure, we can see that angle of refraction ($\angle r$ ) and angle of $33°$ form a pair of alternate opposite angles, so both are equal.

$\therefore$ The angle of refraction, $\angle r=33°$ ( Alternate opposite angles)

Hence, the correct answer is option 2.