retroreflective The direction of transmission
(Reflection) sound waves, light waves or other electromagnetic waves encountered in other media interface and part of the phenomenon is still in the original material. Such as light reflection, wave reflection.
Light in the two substances on the interface to change the direction of transmission and return to the original material in the phenomenon, called light reflection.
1. In the reflection phenomenon, the reflected light, incident light and normal are in the same plane;
2. Reflected light, incident light on both sides of the separation line;
3. The angle of reflection is equal to the angle of incidence.
(Can be summarized as: "three-line coplanar, two-line separation, equal angle.")
The angle of reflection will change when passing through another medium from one medium.
Reflectivity, also known as reflection ability, is the ratio of reflected light intensity to incident light intensity. The surface of different materials have different reflectivities, and their values are expressed as a percentage, and the same material has different reflectivities for different wavelengths of light. This phenomenon is called selective reflection. Therefore, the reflectivity of a material should be specified, for example, the glass with a visible reflectance of about 4%, gold is highly selective, in the vicinity of the green light reflectivity of 50% and infrared light The reflectivity can reach more than 96%, and the reflectivity is also related to the medium and the incident angle of light around the reflective material. All of the above refers to the reflectivity of light at the interface between the material and the air, and is limited to positive incidence.
Full reflex editing
When the light is emitted by the medium (ie, where the light is less propagating), the interface of the medium is reflected back into the original medium.
When the light to the two media interface, only the reflection does not produce the phenomenon of refraction. When the light from the optical media to the optical sparse media, the refraction angle will be greater than the angle of incidence. When the incident angle increases to a certain value, the refraction angle will reach 90 °, then in the optical sparse medium will not appear refracted light, as long as the angle of incidence is greater than the above values, there is no longer the refraction phenomenon, which is total reflection The So the conditions for the total reflection is: ① light must be light from the media to light the media. ② The angle of incidence must be greater than the critical angle.
The critical angle is the angle of refraction corresponding to the incident angle of 90 degrees (only the light from the optical media into the optical sparse media and the angle of incidence is greater than the critical angle, the total reflection occurs)