Three characteristics of pinhole imaging

Inverted, enlarged, real image. Blocking a plate with a small hole between a wall and an object will form the reflection of the object on the wall. We call this phenomenon pinhole imaging. Moving the middle board back and forth will change the size of the image on the wall, which shows the nature of light propagating along a straight line.

Blocking a plate with a small hole between a wall and an object will form the reflection of the object on the wall. We call this phenomenon pinhole imaging. The three characteristics of pinhole imaging are handstand, magnification and real image. The principle of pinhole imaging is that light travels in a straight line in the same uniform medium without gravity interference.

The linear propagation of light has been widely used in ancient astronomical calendars in China. Our ancestors made standard watches and sundials and measured the length and direction of shadows to determine the time, winter solstice and summer solstice. Install peepholes on astronomical instruments to observe the sky and measure the positions of stars.

Some cameras and camcorders use the principle of pinhole imaging-the lens is pinhole (mostly equipped with convex lens to ensure the imaging distance of light), the scene enters the darkroom through pinhole, and the image is left on the film by some special chemicals (such as developer) (digital cameras and camcorders store the image in the memory card through some photosensitive elements).