How the wavelength of a photon is measured experimentally?

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How wavelength of photon is measured experimentally?

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The wavelength of light can be determined from the interference pattern that is created from two-slit interference, and much more precisely by the interference pattern that results from a diffraction grating using a diffraction-grating based spectrometer that has a grating with hundreds and/or thousands of equally spaced lines/grooves: For both two two-slit interference, and for a grating with many lines, $m \lambda= d \sin(\theta)$ for the location of the primary interference maxima, but the measurement with a many-line grating is far more precise.

The wavelength of light can be determined from the interference pattern that is created from two-slit interference, and much more precisely by the interference pattern that results from a diffraction grating using a diffraction-grating based spectrometer that has a grating with hundreds and/or thousands of equally spaced lines/grooves: For both two two-slit interference, and for a grating with many lines, $m \lambda= d \sin(\theta)$ for the location of the primary interference maxima, but the measurement with a many-line grating is far more precise.
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