In an optical experiment, a beam of light travels from a source located at point $E$ to a target at point $F$. The beam encounters a flat mirror at point $O$. To ensure the beam follows the quickest route from $E$ to $F$ after reflecting off the mirror, what must be true about the angles formed with the normal at the reflection point?

• A. The angle of reflection must be twice the angle of incidence.
• B. The angle of incidence must equal the angle of reflection.
• C. The angle of incidence must be half the angle of reflection.
• D. The angle of reflection must be perpendicular to the angle of incidence.

Answer: (B)