[ATM] Foucault test

[John Lynch <john_p_lynch2004@yahoo.com>]

David,

My description does indeed give you the radius of
curvature, which is twice the focal length.  The
relative difference between the knife-edge reading at
center and edge are zonal measurements with different
radii of curvature.  Each time you figure the mirror
and retest, you can actually start from a slightly
different point at center, so the relative
measurements are what's important.

John Lynch


	
		
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