In photography, exposure is the amount of light reaching the camera film or sensor, as determined by shutter speed, lens aperture, and scene luminance. By adjusting the exposure and sensor/film sensitivity (ISO), it is possible to get a bright or dark result.
It is quite apparent that photography has never been any flat-Earthers’ strongest point. There are many misconceptions in flat-Earth circles that arise from their ignorance about photography. One of such misconceptions is exposure.