Fresnel Diffraction at a Single Slit
Fresnel Diffraction at a Single Slit
The intensity in a Fresnel diffraction pattern for a single slit is given by the equation
I=+
1
2
2
CX+-CX-
2
λd
2
λd
b
2
2
λd
2
λd
b
2
1
2
2
SX+-SX-
2
λd
2
λd
b
2
2
λd
2
λd
b
2
where and are the Fresnel integrals, is the wavelength of light, is the distance of the diffracting slit from the screen, is the width of the diffracting slit, and is the range of the diffracting pattern on the screen from the center of the space between the edges of the geometrical shadow. The dimensions of the intensity profiles are given in arbitrary units.
C
S
λ
d
b
X