Basic properties of light

1 linear propagation of light

Light travels in straight lines in a homogeneous medium.

2 reflection and refraction

When the light is sent to the interface of the different medium, the reflection and refraction is reflected, and the reflected light and the refracted light are arranged on the same plane (the human surface) which is formed by the normal point of the human shooting light and the human shooting point on the interface.

3 transmission and absorption

When the lighting design in the shot to the transparent medium at the interface of a part of the light being reflected in the interface, the other part is through the interface of medium inside the next person, arrive at the interface of the light is reflected again, the remaining part of the light emitting medium outside. In this way, part of the light is transmitted through the medium, which is called transmission; of course, a part of the incident light is absorbed by the medium and converted into other energy.

4 interference and diffraction

Coherent (the same frequency and does not change with time of the two column two wave) wave Shengjia results in a correlation of two light waves, light intensity will place more strong, but weak place but weaker phenomenon. This phenomenon is known as the light of the interference of lighting engineering. In the light propagation, it can be found that there are many apertures behind the small obstacle, which is called the diffraction of light.