What does exposure refer to in photography?

• A. The angle of light hitting gem.
• B. The brightness of the display.
• C. The amount of time light has to enter a camera.
• D. The distance light travels.

Answer: (C)

Exposure in photography refers to how long the camera's sensor is exposed to light. The shutter opens for a certain amount of time, called shutter speed, measured in seconds or fractions of a second. The longer this duration, the more light reaches the sensor, producing a brighter image; a shorter duration lets in less light, yielding a darker image. This exposure duration works together with aperture and ISO to determine overall brightness and image quality. The idea here is about the time light has to hit the sensor, not the brightness of a display, the angle of light, or how far light travels.