It consists of small flat mirrors that are at right angles to each other. Because of the reflection of light, light from the car, neon, street lights and other light sources is reflected to the driver, so that the driver can see the front cyclist, thus avoiding traffic accidents.
A prism whose cross section is an isosceles right triangle is called a total reflection prism. Isosceles right triangle ABC represents the cross section of a total reflection prism, it
The two right-angled sides AB and BC represent two mutually perpendicular sides of the prism. If the light hits the AB plane vertically, it will follow the original side.
Shooting into the prism, hitting the AC surface, because the angle of incidence (45°) is greater than the critical angle (42°) at which light enters the air from the glass, the light will be at AC.
Total reflection occurs on the surface and is emitted from the prism in a direction perpendicular to BC. If the light is perpendicular to the AC surface, after entering the prism in the original direction,
Total reflection occurs on both sides of AC and BC, and finally life is emitted from the AC surface in the opposite direction when incident in the opposite direction of incidence.
This principle is used in many places, such as bicycle taillights, and this principle is used.
With the development of society, there are more and more vehicles on the road. The weak reflection is not enough to attract the attention of passing vehicles. Therefore, there are some energy sources that use batteries and the illumination of LED lights that emit light as a safety warning. Keep it safer