Which term describes the part where light is collected to form a digital image?

• A. Exposure
• B. Focal Plane
• C. Sensor
• D. HD Resolution

Answer: (C)

The main idea here is identifying the part that directly collects light to create a digital image. That role belongs to the sensor. In a camera, light from the scene passes through the lens and is focused onto the focal plane, but it is the image sensor that actually detects photons and converts them into electrical signals that become the digital image. Exposure controls how long the sensor is exposed to light (and thus how bright the image appears), not which component collects light. The focal plane is the optical location where the image is formed, while the HD resolution describes how many pixels the final image has, not the light-collecting element.