Question

what is the difference between fraunhhofer and Fresnel diffraction ​

Answer 1

Answer:

Explanation:

FRESNEL DIFFRACTION

Fresnel diffraction can be observed if the source of light and the screen at which diffraction pattern is formed are kept at finite distance from the diffracting obstacle.In this situation the wave fronts falling on the obstacle are not plane.Similarly the wave fronts leaving the obstacle are not plane.

FRAUNHOFER DIFFRACTION

Fraunhofer diffraction can be observed if the source of light and screen at which diffraction pattern is formed are placed at infinite distance from the diffracting obstacle.This can be done by using two converging lenses.One lens is placed between the source of light and the obstacle while the other lens is placed between the obstacle and screen.The lens between the source and obstacle makes the rays parallel to each other while the lens between the obstacle and screen ,focus the parallel rays at point on the screen.

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Answer 2

Explanation:

The basic difference between fresnel and Fraunhofer diffraction is that in Fresnel diffraction the source of light and screen is at a finite distance from the obstacle, while in Fraunhofer diffraction if the source of light and screen is at an infinite distance from the obstacle.