As viewed from underwater, at what angle from the vertical does the Sun appear to set?
A)0°
B)90°
C)49°
D)41°
E)45°

Question

Quizplus · Accepted Answer

The angle of incidence equals the angle of refraction. The angle of incidence is the angle between the incoming light ray and the normal to the surface. The angle of refraction is the angle between the refracted light ray and the normal to the surface. In this case, the incoming light ray is from the Sun, and the normal to the surface is the vertical. The angle of incidence is therefore 90 degrees. The angle of refraction is 49 degrees. Therefore, the Sun appears to set at an angle of 49 degrees from the vertical.

As Viewed from Underwater, at What Angle from the Vertical