Fresnel number of a regular polygon and slit.
The concept of the Fresnel number is generalized to make it possible to describe the regular polygon and slit illuminated by a homogeneous plane wave. The generalization is based on nonlinear regression of the axial intensity distribution curve. A useful analytical expression for the Fresnel number is presented. A simple experiment to show the different Fresnel numbers in one observation plane is illustrated.
Wang
S
S
Department of Physics, Zhejiang University, Xi-Xi Campus, Hangzhou 310028, China.
Lin
Q
Q
Yu
L
L
Xu
X
X