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#1
September 23rd 03, 04:00 AM
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Sodium Lamp Diffraction Rings
I was told that you can see the diffraction pattern on a refractor air
spaced doublet if you hold it under a street lamp. I tried it and it works. If the lines are concentric and appear like a neat bullseye pattern it means the collimation is good. Has anyone ever heard this? Is this true? GM 
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