Thread: Argon Purging of Closed Tube Scopes
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Old 23-09-2015, 12:14 PM
glend (Glen)
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The refractive index of Argon is 1.0003032, for Air it is 1.000293, a vacuum is 1.0000.
If you can detect a focal shift over a refractive difference of 0.0000102 then you might notice it.
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