Question

what is the difference between fraunhofer and fresnel type of diffraction​

Answer 1

Explanation:

Another key difference between Fresnel and Fraunhofer diffraction is that Fresnel diffraction patterns change as we propagate them further 'downstream' of the source of scattering, whereas the shape of the intensity of a Fraunhofer diffraction pattern stays constant.

Answer 2

diffraction

phenomenon of the bending of light waves from around the edges of opaque obstacles and there encroachment in the geometrical shadow of obstacle or aperture is defined as diffraction of light .

fresenal diffraction

• no lenses required
• sperical of cylindrical wavefront is used
• the source is near and on one side of spherical in screen also near to obstacle and on the other side.
• examples : circular aperture ,ring etc.

fraunhoffer diffraction

• convex convex lens is required
• plane wavefront is used
• source and screen are both effectively at infinite distance from the obstacle.
• example: single slit , double slit etc.

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