Question

what is necessary for easy occurrence of fresnels diffraction​

Answer 1

Fresnel diffraction occurs when either the distance from the source to the obstruction or the distance from the obstruction to the screen is comparable to the size of the obstruction. These comparable distances and sizes lead to unique diffractive behavior.

Answer 2

Explanation:

fresnels diffraction occurs when either the distance from the source to obstruction or the distance from the obstruction to the screen is comparable to the size of the obstruction this comparable distance and size lead to unique difractive behaviour