Interpretation of photographic terms: layered reflection arrangement and refraction arrangement

Chinese name: level English name: stratum layer definition: vertical structure in a community divided according to the height of plant assimilation organs.

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The law of refraction was discovered by the Dutch mathematician Snitch, which is the law to determine the direction of refracted light in the phenomenon of light refraction. Snell's law

[1] When light enters the second medium (refractive index n2) from the first medium (refractive index n 1), on the smooth interface, part of the light refracts after entering the second medium from the first medium. Experiments show that (1) refracted ray lies in the plane determined by incident ray and interface normal; (2) The refracted ray and the incident ray are on both sides of the normal respectively; (3) The ratio of sine of incident angle I to sine of refraction angle I' is constant for two kinds of media with certain refractive index. Simply put, when light enters the medium at a high speed of light, the refraction angle is smaller than the incident angle; The refraction angle is greater than the incident angle when entering the medium with high light speed from the medium with low light speed.

When light is reflected on a smooth interface, the law that determines the propagation relationship between reflected light and incident light. One of the basic laws of geometric optics. As shown in the figure, the plane formed by the incident light IO and the interface normal ON at the incident point O is called the incident plane, and the propagation directions of the incident light IO and the reflected light OR can be reflected by the reflection law respectively.

The angles θi and θr between them and the normal are expressed. θi and θr are usually called incident angle and reflection angle, respectively. The law of reflection is as follows: ① Both reflected light and incident light are in the incident plane. ② The reflection angle is equal to the incident angle, that is, θ i = θ r. The above reflection law only applies to the interface of isotropic media, and only solves the problem of light propagation direction, but not the problem of energy distribution during reflection. The reflection of light is very similar to the rebound of an elastic ball on a smooth desktop in mechanics. I Newton once proved the law of over-reflection according to the particle theory of light (see the duality of light). The law of light reflection was originally obtained from experiments, which can be proved according to Fermat's principle, geometrically by Huygens' principle [1] (see huygens-fresnel principle) from the viewpoint of light fluctuation, and theoretically by the boundary conditions of electromagnetic field.