Prism, a transparent object surrounded by two intersecting planes that are not parallel to each other, used for splitting or dispersing light beams. Prism is a polyhedron made of transparent materials (such as glass, crystal, etc.). It is widely used in optical instruments. Prisms can be divided into several types according to their properties and applications. For example, in spectral instruments, the "dispersion prism" that decomposes the composite light into spectrum is more commonly used as equilateral prism; In periscope, binocular telescope and other instruments, changing the direction of light to adjust its imaging position is called "total reflection prism", which generally adopts
Right Angle Prism.
Function of reflection prism: when the reflection prism (or reflector) is used as the reflector for ranging, the reflection prism receives the optical signal sent by the total station and reflects it back. The total station sends out the optical signal, receives the optical signal reflected from the reflecting prism, calculates the phase shift of the optical signal, so as to indirectly obtain the time of light passing, and finally measure the distance from the total station to the reflecting prism.
Principle of reflection prism: the working principle of reflection prism is actually the reflection law and refraction law of light. When light is reflected in the same medium, its reflection angle is equal to the incident angle; When light is incident from one medium perpendicular to two medium planes to another medium, it will not be refracted.
