Grade 12Electromagnetic Induction
what is Fresnel and Fraunhofer diffraction
what is Fresnel and Fraunhofer diffraction
4 Answers
noogler
Approved Tutor Answer11 Years agoFraunhoffer: we can observe it if b2/l/\
FResnel: we can observe it if b2/l/\ ~1
rahul
Approved Tutor Answer11 Years ago Fraunhofer Diffraction | Fresnel Diffraction | |
|---|---|---|
| Wave fronts | Planar wave fronts | Cylindrical wave fronts |
| Observation distance | Observation distance is infinite. In practice, often at focal point of lens. | Source of screen at finite distance from the obstacle. |
| Movement of diffraction pattern | Fixed in position | Move in a way that directly corresponds with any shift in the object. |
| Surface of calculation | Fraunhofer diffraction patterns on spherical surfaces. | Fresnel diffraction patterns on flat surfaces. |
| Diffraction patterns | Shape and intensity of a Fraunhofer diffraction pattern stay constant. | Change as we propagate them further ‘downstream’ of the source of scattering. |
rahul
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morden
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