40x optical zoom lens for mobile

The reflection inside the prism is not caused by total reflection, because the angle of the incident light at the time of reflection is less than the critical angle, that is, the minimum angle of total reflection, so both reflecting surfaces should be plated as reflecting mirrors; The incident and outgoing surfaces should be coated with anti reflection film to reduce reflection. Although the fifth surface is not used, the included angle with the two reflecting surfaces is an obtuse angle (greater than the internal angle of a right angle).

Amisi prism amisi prism is named after Italian astronomer Giovanni amisi. It is an optical prism with dispersion function and is often used in spectrometers. Amish prism consists of two triangular prisms. The first triangular prism is usually made of coronal glass with medium dispersion ability, and the second is made of flint glass with high dispersion. When the light enters the first prism, it is first refracted, then enters the interface between the two prisms, and then emits in a direction almost perpendicular to the surface of the second prism. The angle and material of the prism are selected so that the light of one wavelength (color), usually the central wavelength, leaves the prism parallel to the incident beam. The deflection angle of other wavelengths is related to the dispersion ability of the material. Observing a light source passing through a prism can show the optical spectrum of the light source