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How to measure light wavelength exactly?

by silin
Tags: light, measure, wavelength
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silin
#1
Jun13-05, 06:53 AM
P: 26
Hi people,

does anybody know what the simplest device that can be used to measure monochromatic light wavelength exactly? Thanks.
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OlderDan
#2
Jun13-05, 09:53 AM
Sci Advisor
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P: 3,031
Quote Quote by silin
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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