When light passes through an ordinary window pane, its angle of emergence is
A) usually more than its angle of incidence.
B) usually less than its angle of incidence.
C) always more than its angle of incidence.
D) always less than its angle of incidence.
E) the same as its angle of incidence.

Question

Quizplus · Accepted Answer

When light passes through an ordinary window pane (assuming the glass is of uniform thickness and the surfaces are parallel), it emerges at the same angle as its angle of incidence due to the principle of reversibility of light. This principle states that light follows the same path if its direction is reversed, hence the angles of incidence and emergence are equal when refraction occurs at two parallel surfaces.

When Light Passes Through an Ordinary Window Pane, Its Angle