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Foucault Testing Vs Wavelength

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Posted by Joe Mayenschein/">Joe Mayenschein on February 15, 2000 00:17:01 UTC

This may seem like a simple question, but I was wondering, When a mirror is stated to have a figure that is 1/4 wave or better, what type of light are they stating?

1/8th wave in red light would be a many waves error in the blue end of the spectrum.

The other question is when using a foucault testing system if you were to use a monochronamatic light source, with a very short wavelength would your accuracy be any better?

Or if you went way into the long red end would the readings for each zone be furthur apart?

Just wondering,, does it matter at all during the foucault test? and when they make that 1/10th wave accuracy,, compared to what?


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