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Diffraction: Difference between revisions
→Fresnel diffraction
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===Fresnel diffraction=== | ===Fresnel diffraction=== | ||
{{main | Wikipedia: Fresnel diffraction}} | {{main | Wikipedia: Fresnel diffraction}} | ||
Fresnel diffraction can be used for intermediate distances. | Fresnel diffraction can be used for intermediate distances (near-field), when <math>F = \frac{a^2}{L \lambda} \geq 1</math>. | ||
The Fresnel approximation is: | The Fresnel approximation is: | ||