Using Huygens Principle, derive the law of reflection which states that the angle of incidence is equal to the angle of reflection on a smooth surface.

• A. The angle of incidence equals the angle of reflection.
• B. The incident ray and the reflected ray are perpendicular to each other.
• C. The incident ray and the reflected ray are in the same direction.
• D. The incident ray and the reflected ray are on the same line but are in opposite directions.

Answer: (A)