what isFresnel and Fraunhofer diffraction
morden , 9 Years ago
Grade 12
Electromagnetic Induction> what is Fresnel and Fraunhofer diffractio...
4 Answers
noogler
Last Activity: 9 Years ago
Fraunhoffer: we can observe it if b2/l/\
FResnel: we can observe it if b2/l/\ ~1
rahul
Last Activity: 9 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
Last Activity: 9 Years ago
u can check out the complete answer using the inspect element tool by F12
morden
Last Activity: 9 Years ago
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