Question

Differentiate between Fresnel and Fraunhofer diffraction.

Answer 1

S. No.	Fresnel diffraction	Fraunhofer diffraction
1.	Spherical or cylindrical wavefront undergoes diffraction	Plane wave front under goes diffraction
2.	Light wave is from a source at finite distance	Light wave is from a source at infinity
3.	For laboratory conditions, convex lenses need not be used	in laboratory conditions, convex lenses are to be used
4.	Difficult to observe and analyse	Easy to observe and analyse