Which factor does not change the FOV?

• A. Lens
• B. Focal length
• C. Detector resolution
• D. Sensor temperature

Answer: (D)

FOV is the angular extent of the scene captured by the camera, set by the optics and the detector size. The lens and its focal length determine how wide or narrow the angle is: a longer focal length or smaller sensor yields a narrower FOV, while a shorter focal length or larger sensor gives a wider FOV. Detector resolution only affects how many pixels cover that angle—how much detail you see within the same angular span—not the angle itself. Sensor temperature, on the other hand, doesn’t alter the optical geometry at all; it may affect image quality (noise, sensitivity) but not the width of the scene captured. So temperature does not change the FOV.