Question

Differentiate between fresnel and fraunhofer class diffraction

Answer 1

Fresnel Diffraction

1:If the source of light and screen are at finite distance from the obstacle ,then the diffraction called fresnel diffraction.

2:The corresponding rays are not parallel.

3:The wave fronts falling on the obstacle are not plane.

Fraunhofer diffraction

1:If the source of light and screen are at infinite distance from obstacle then the diffraction is called fraunhofer diffraction.

2:The corresponding rays are not parallel.

3:The wave fronts falling on the obstacle are plane.