Diffraction of light

1. Diffraction of light

Diffraction is the same as interference , Are one of the important characteristics of volatility , When the wave encounters obstacles in the process of propagation , Able to move around the edge of an obstacle , This phenomenon of deviating from a straight line is called wave diffraction

Fresnel diffraction ：

Fraunhofer diffraction

Huygens - Fresnel principle

In the process of wave propagation , Wavelets emanating from points on the same wavefront , Meet at some point in space through propagation , Generate coherent superposition

2. Fraunhofer diffraction

3. Half wave zone method

summary ：

4. Width of bright stripes at all levels