What is the principle of the camera?

The principle of imaging is simply three parts: pinhole imaging, lens refraction effect and silver salt effect.

During the Renaissance 500 years ago, people discovered the black box effect, which is pinhole imaging.

The refraction effect of lenses was discovered by the ancient Romans, and scholars with poor eyesight found that the original blurred words could be seen clearly through spherical glass.

The silver salt effect was discovered by scientists in the18th century, that is, the silver salt will gradually turn black in the sun.

The above three effects constitute the initial model of the camera.

The photosensitive element of digital camera is a physical reaction.