Relationship between photosensitive effect and photographic distance

The relationship between photosensitive effect and photographic distance is that photosensitive effect is inversely proportional to the square of photographic distance.

Photosensitive effect refers to the phenomenon that when light shines on a substance, electrons in the substance are excited and charges are separated. When the photon energy is greater than the band gap energy of the material, the photon is absorbed, which makes the electrons in the material jump to the conduction band, forming free electrons and holes. In photography, photosensitive materials (such as film or image sensor) play the role of recording light information. When the light enters the photographic equipment through the lens, the intensity of the light will decrease with the increase of distance. According to the law of light propagation, the intensity of light is inversely proportional to the square of distance.