The angle of incidence equals the angle of ____________________.

• A. Reflection
• B. Refraction
• C. Diffusion
• D. Absorption

Answer: (A)

Light follows the law of reflection when it meets a smooth surface: the angle between the incoming ray and the normal (a line perpendicular to the surface) equals the angle between the outgoing ray and that same normal. So, if the light hits the surface at a certain angle to the normal, it reflects at the same angle on the other side. This symmetry is what makes mirrors predictable in how they bounce light. Refraction would bend the light as it enters a different medium, changing the angle according to Snell’s law; diffusion disperses light in many directions; absorption takes energy from the light rather than redirecting it with a specific angle.