A brief introduction of prism
A transparent object formed by a plane that is intersected by 22 intersecting but not parallel to each other, used to divide light or to make a dispersion of the beam.
The effect of splitting or dispersion of a beam
Prism is a polyhedron made of transparent materials (such as glass, crystal, etc.). It is widely used in optical instruments. Prism can be divided into several types according to its properties and uses. For example, in the composite optical spectrum instrument for the spectral decomposition of "prism", is commonly used three equilateral prism; changes in optical periscope, binocular telescope instruments such as the direction, thereby adjusting the imaging position is called "total reflection prism", generally by the right angle prism.
The side of a prism: the plane of the incident light is called the side.
The main cross section of a prism: the plane perpendicular to the side is called the main section. According to the shape of the main section, it can be divided into three prism, right angle prism, five angle prism, etc. The main section of the three prism is a triangle. The three prism has two refraction surfaces, the angle of which is called the top angle, and the plane of the top angle is the bottom.
According to the law of refraction of light through the prism of three, two times to the bottom surface deflection angle between Q rays and the incident light angle. Its size is called by the medium refractive prism and angle of incidence rate of n I. When I is fixed, different wavelengths of light have different deflection angle in the visible the light deflection angle is the biggest purple, the smallest is red.