Which term describes the bouncing back of light when it strikes a surface?

Which term describes the bouncing back of light when it strikes a surface?

• A. Refraction
• B. Relief
• C. Refractive index (RI)
• D. Reflection

Answer: (D)

Reflection is the bouncing back of light when it strikes a surface. When light hits a boundary, the portion that reflects does so at the same angle it arrived (the angle of incidence equals the angle of reflection), especially on smooth, shiny surfaces like mirrors. This is what lets us see clear images or a clear shine on polished floors and water surfaces. Refraction, by contrast, is light bending as it passes into a different medium and changing speed, which is described by the material’s refractive index—this index tells how much light slows, not how it bounces back. Relief isn’t a term used to describe light behavior at a surface, as it refers to texture or relief on the surface rather than how light interacts with it. So the behavior described—the light bouncing back from a surface—is the hallmark of reflection.

Reflection is the bouncing back of light when it strikes a surface. When light hits a boundary, the portion that reflects does so at the same angle it arrived (the angle of incidence equals the angle of reflection), especially on smooth, shiny surfaces like mirrors. This is what lets us see clear images or a clear shine on polished floors and water surfaces. Refraction, by contrast, is light bending as it passes into a different medium and changing speed, which is described by the material’s refractive index—this index tells how much light slows, not how it bounces back. Relief isn’t a term used to describe light behavior at a surface, as it refers to texture or relief on the surface rather than how light interacts with it. So the behavior described—the light bouncing back from a surface—is the hallmark of reflection.