How to measure light wavelength exactly?

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Hi people,

does anybody know what the simplest device that can be used to measure monochromatic light wavelength exactly? Thanks.
 

OlderDan

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silin said:
Hi people,

does anybody know what the simplest device that can be used to measure monochromatic light wavelength exactly? Thanks.
The simplest ways I can think of involve interference. For example, you can use:
A diffraction grating (probably the best)
A pair of optical flats with high precision spacers
An optical flat and a precision plano convex lens of known radius to form Newton's rings.
 

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