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Diffraction gratings
Diffraction gratings
Understanding How a diffraction Grating works in dispersing light.
Understanding How a diffraction Grating works in dispersing light.
Light contains many wavelengths therefore the light is diffracted in all directions when it leaves a grating.
Light contains many wavelengths therefore the light is diffracted in all directions when it leaves a grating.
The different path difference gives rise to a phase difference in the waves.
The different path difference gives rise to a phase difference in the waves.
If the phase difference is half a wavelength then the waves that meet will cancel out and there is no light - destructive interference.
If the phase difference is half a wavelength then the waves that meet will cancel out and there is no light - destructive interference.
If the phase difference is a wavelength the waves add - constructive interference.
If the phase difference is a wavelength the waves add - constructive interference.
This interference produces a spectrum were because sinθ ∝ λ
This interference produces a spectrum were because sinθ ∝ λ
The greater the angle of diffraction the greater the wave length. From the diagram above we see that red is diffracted the most and blue the least.
The greater the angle of diffraction the greater the wave length. From the diagram above we see that red is diffracted the most and blue the least.
Another explanation of diffraction gratings. Gives a good explanation of phase difference and interference.
Another explanation of diffraction gratings. Gives a good explanation of phase difference and interference.
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