The openings of the lens diaphragm through which light passes are called?

• A. Aperture
• B. ISO
• C. HD Resolution
• D. Depth of field

Answer: (A)

The openings are called the aperture. This is the adjustable hole in the lens diaphragm that controls how much light passes through to the sensor. It’s described with f-stops (like f/2.8 or f/11): a larger opening (lower f-number) lets in more light, while a smaller opening (higher f-number) lets in less light. The aperture also influences depth of field—the range of sharp focus in a scene—where a wide aperture gives a shallow depth of field and a small aperture yields a deeper one. The other terms refer to different concepts: ISO is sensor sensitivity, HD resolution relates to display quality, and depth of field is a result of aperture and other factors rather than the opening itself.