Fresnel and Fraunhofer diffractions
Based on the type of wavefront which undergoes diffraction, the diffraction could be classified as Fresnel and Fraunhofer diffractions. The differences between Fresnel and Fraunhofer diffractions are shown in Table 6.4.
As Fraunhofer diffraction is easy to observe and analyse, let us take it up for further discussions.
Table 6.4 Difference between Fresnel and Fraunhofer diffractions
Fresnel diffraction
• Spherical or cylindrical wavefront undergoes diffraction
• Light wave is from a source at finite distance
• For laboratory conditions, convex lenses need not be used
• Difficult to observe and analyse
Fraunhofer diffraction
• Plane wavefront undergoes diffraction
• Light wave is from a source at infinity
• In laboratory conditions, convex lenses are to be used
• Easy to observe and analyse
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