Question

3 light refracts when:
a it changes speed
b it changes from a particle to a wave
c its density changes
d it encounters a solid object

Explanation:

To solve this, we analyze each option:

• Option A: Refraction occurs when light changes speed as it passes from one medium to another (e.g., air to water). This matches the definition of refraction.
• Option B: Light has dual - particle - wave nature, but refraction is not related to changing from particle to wave.
• Option C: Light does not have density in the way this option implies, and density change is not the cause of refraction.
• Option D: Light can interact with solid objects in other ways (like reflection), but encountering a solid object is not the cause of refraction.

Answer:

A. It changes speed