What does the term 'brightness' of light indicate?

• A. Color perception
• B. Wavelength of light
• C. Intensity of light received
• D. Distance of light source

Answer: (C)

The term 'brightness' of light refers specifically to the intensity of light received by the observer. This intensity is a measure of how much light is emitted from a source, transmitted through a medium, or reflected from a surface, and it directly affects how we perceive the light. Brightness can be influenced by the distance from the light source; as you move further away, the light appears dimmer due to the decreased intensity reaching your eyes.

Understanding brightness in this context allows us to determine how well-lit an area is and how visible objects are under various lighting conditions. The other options relate to different characteristics of light—such as color perception, wavelength, and distance—but do not capture the specific meaning of brightness as it relates to light intensity.