At the intersection of the propagation direction of an electromagnetic wave
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Diffraction
General Subject
The modification of the direction of propagation of a wave when passing through an opening of size "a".
- Characteristics:
- α: half angular deviation.
- D: distance screen - slit
- L: length of the central spot
- -: size of half-secondary spots
- a: slit / wire size
- Diffraction Condition:
- Relations:
- α < λ
- "a" is of the same order of magnitude as D
- tan(θ) = L / D
- Calculation of θ:
- tan(θ) for small angles
- tan(θ) = opposite / adjacent
- SPC = λ / a
- Proportionality:
- θ = 0.001λ = 2L = 20D = 2AD / a
Observations:
θ is proportional to λ, where λ is the wavelength in meters, a is the slit / wire opening in meters, and θ is the half-opening in radians.
Evolution of the diffraction phenomenon:
The larger the distance D between the slit and the screen, the larger L becomes, resulting in a more significant diffraction phenomenon.
Calculation of the coefficient k = λ:
The smaller the opening of the slit / wire, the larger L becomes, resulting in a more significant diffraction phenomenon.
