Which term describes reflection from a large, smooth interface?

Which term describes reflection from a large, smooth interface?

• A. Specular reflection
• B. Nonspecular reflection
• C. Absorption
• D. Refraction

Answer: (A)

Specular reflection describes reflection from a large, smooth interface. When the surface is smooth compared with the light’s wavelength, the incident rays reflect in a single, well-defined direction, following the law of reflection where the angle of incidence equals the angle of reflection relative to the normal. That produces a clear, mirror-like image. If the surface were rough, reflections would scatter in many directions (nonspecular or diffuse reflection), so you wouldn’t see a sharp image. Absorption means light is taken in, not reflected, and refraction is the bending of light as it passes into a different medium, not the reflection from the surface.

Specular reflection describes reflection from a large, smooth interface. When the surface is smooth compared with the light’s wavelength, the incident rays reflect in a single, well-defined direction, following the law of reflection where the angle of incidence equals the angle of reflection relative to the normal. That produces a clear, mirror-like image. If the surface were rough, reflections would scatter in many directions (nonspecular or diffuse reflection), so you wouldn’t see a sharp image. Absorption means light is taken in, not reflected, and refraction is the bending of light as it passes into a different medium, not the reflection from the surface.