Difference between grating interference principle and self-imaging principle

The difference between these two principles lies in the physical process and application direction.

The grating interference principle is based on the interference principle of wave optics, which is explained according to the interference phenomenon caused by the interaction between light wave and grating. The principle of self-imaging is based on the optics and diffraction theory of light, and is explained by the image formed by the diffraction of light through a lens or grating and then convergence.

The principle of grating interference is widely used to measure and analyze the characteristics of light waves, such as measuring the wavelength and refractive index of light. Self-imaging principle is widely used in microscope, telescope, photography and other fields to form images of objects within a certain distance.