The incidence angle is measured relative to
A) The line normal to the surface
B) A line parallel to the surface
C) The line followed by the reflected ray
D) None of the above

Question

Quizplus · Accepted Answer

The incidence angle is always measured relative to the line normal to the surface. This is because the angle of incidence is the angle between an incoming ray of light and a line perpendicular to the surface at the point where the ray intersects the surface.

The Incidence Angle Is Measured Relative to