What are the functions of prisms? The principle is?

1. Because the same medium has different refractive indexes for various monochromatic lights, when passing through a prism, the deflection angles of each monochromatic light are different. Therefore, when white light passes through a prism, each monochromatic light will be separated, that is, dispersion.

2. Objective To explore the clinical application scope and efficacy of pressed prism. The method is to correct and alleviate micro-degree strabismus, homosexual strabismus, over-correction and under-correction after strabismus correction by pressing the corresponding membranous prism on the frame lens

3. Fingerprint collection head, fingerprint The collection head uses the total reflection principle of a micro prism, and the light source is reflected from the prism to the optical sensor. When a person's finger presses on the glass surface, the surface of the micro prism is changed due to the different pressure of the fingerprint's ridges and valleys; the reflected light is obtained by the micro prism, and the amount of reflected light depends on the pressure of the fingerprint's ridges and valleys on the glass surface. Depth and oils between skin and glass. After image preprocessing, digitization, grayscale processing, and image enhancement, a fingerprint image is formed.

4. The principle of refractory stereoscopic film is to shoot simultaneously with two cameras simulating the perspective of human eyes, and also use two projectors during screening (two projectors plus two prism lenses respectively) Simultaneously projected onto two screens on the left and right, refractive stereoscopic movie glasses are composed of two prisms with opposite refraction directions and a baffle. The baffle mainly allows one eye to see only one picture, that is, the right eye can only see the right picture, and the left eye can only see the left picture. Due to the refraction of the prism, the left and right images seen by the two eyes appear to be emanating from the same position in the middle. In this way, two eyes see two images from the same position, creating a three-dimensional sense.