The operation of a diffraction grating is based on the phenomenon of diffraction of a light wave, which, passing through a system of transparent and opaque regions, is divided into separate beams of coherent light. They undergo stroke diffraction. And at the same time they interfere with each other. Each wavelength has its own diffraction angle, so white light is decomposed into a spectrum.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.