Which process involves light being redirected as it passes through a medium?

• A. Reflection
• B. Refraction
• C. Diffraction
• D. Scattering

Answer: (D)

The process that involves light being redirected as it passes through a medium is refraction. When light travels from one medium to another, such as from air into water, its speed changes, which causes the light to change direction. This bending of light is due to the difference in optical density between the two mediums. The angle at which the light enters and exits the medium, as well as the material properties, determines the degree of bending.

Understanding refraction is crucial in various applications, such as in the design of lenses, prisms, and optical instruments. Unlike other processes like reflection, where light bounces off a surface, or diffraction, which involves the bending of light around obstacles, refraction specifically pertains to the change in speed and direction of light as it passes through different materials. Scattering, on the other hand, refers to light being absorbed and re-emitted in many directions, which is a different phenomenon entirely related to particles in a medium rather than the bending due to a change in medium.