A prism is a transparent prismatic body consisting of several optical planes, and a cross-section perpendicular to the side prism is called the main cross-section of the prism. If the prism of the main cross section is a triangle called a prism, the prism of the main cross section is a right triangle called a right-angle prism. Depending on the use, the prism can be divided into reflective prisms and refractive prisms, the main purpose of which is to change the direction of light propagation. The refractive prism is used as a white light dispersion, light deflection, and image inverted image.
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