Re: [ATM] No fringes

[Mike Lockwood <melockwo@uiuc.edu>]

Hi,

Dale Eason wrote:
> I doublt a geen LED is monochromatic enough.  I have
> looked at them with a spectrograph and they have a
> very broad spectrum.  I think I even remember some
> red.

Dale's right - LEDs won't do it.  Try setting the pieces under a large 
fluorescent light (no filter) and you should see multi-colored 
fringes.  If that works, you've got a reasonable air gap and the 
pieces are clean enough.

After that, find a better source of light.  I use black lights without 
the blue filter they normally put around them.  They have a strong 
green line that I use a filter gel to help isolate.  For a quick test, 
you can try compact fluorescent lights bulbs with a red filter, but 
it's not as good as the black lights.

I am told fluorescent bug lights have a strong green spectral line, 
too.  Since they're brighter, I may try these in the future.

	Mike Lockwood

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