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Chapter: 12th Physics : UNIT 7 : Wave Optics

Fresnel and Fraunhofer diffractions

Based on the type of wavefront which undergoes diffraction, the diffraction could be classified as Fresnel and Fraunhofer diffractions.

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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12th Physics : UNIT 7 : Wave Optics : Fresnel and Fraunhofer diffractions |

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12th Physics : UNIT 7 : Wave Optics


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