How Far Above the Horizon Is the Moon When Its $\degree$

Multiple Choice

How far above the horizon is the moon when its image, reflected in a calm lake, is completely polarised? (nwater = 1.33.)

A) 22.2 $\degree$
B) 7.7 $\degree$
C) 16.6 $\degree$
D) 36.9 $\degree$
E) 53.1 $\degree$