Light is incident from air on the surface of a transparent medium.

When V is equal to the Brewster angle, which angle is equal to 90°?

A.     \({\text{V}} + {\text{W}}\)

B.     W only

C.     \({\text{X}} + {\text{Y}}\)

D.     Z only

C

The diagram clearly states that the angles are not drawn to scale. Despite this, many candidates chose response A, presumably as those angles looked as if they added together to make a right angle. But it was good to see that the majority of candidates were not fooled by appearances and selected the correct response of C.