Basic principles of microphotography

Microphotography is a method of projecting the image of eyepiece onto photographic film, making the film sensitive and recording the phenomena in the field of vision. In photomicrography, the projection of the image is shown in figure 1. After the light emitted by the tiny object W in the film enters the objective O, an enlarged and inverted real image is generated at I 1, which is slightly lower than the focal plane Fe of the eyepiece, and the distance between them is D. After being further enlarged by the eyepiece, the real image exits the eyepiece and forms an enlarged real image on the screen, with the position I2. If the screen is ground glass, you can focus on the view, and then change the negative after focusing, and you can shoot.