The optical principle of bicycle taillights

- Dec 28, 2017 -

The cross-section is a isosceles right-angled triangular prism called the total reflection prism. The isosceles right triangle ABC represents the cross section of a total reflection prism

The two right-angled edges AB and BC represent the two mutually perpendicular sides of the prism. If the light hits the AB surface vertically, it will follow the original square

As the incident angle (45 °) is greater than the critical angle (42 °) at which light enters the air from the glass, the light will strike the AC surface

Total reflection occurs on the face and emerges from the prism in a direction perpendicular to BC. If the light perpendicular to the AC plane, along the original direction into the prism, at

Total reflection occurs on both the AC and BC surfaces, and finally emerges from the AC surface in the opposite direction when incident on the opposite direction

This principle is used in many places, such as bicycle taillights, to take advantage of this principle.

With the development of society, more and more vehicles on the road, by weak reflection is not enough to cause the attention of passing vehicles, so now there are some with the battery energy, and LED lighting will be illuminated as a safety warning to Make it safer