Ideally you should have a broad source - (size, not wavelength band!) - look at the specular reflection. If what you have are LEDs, use them to illuminate a piece of white paper, and look at its reflection.
********************************************
"When traveling, always carry a
flagon of whiskey in case of
snakebite and furthermore always
carry a small snake."
--W. C. Fields
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George Spagna
Department of Physics
Randolph-Macon College
P.O. Box 5005
Ashland, VA 23005-5505
phone: (804) 752-7344
FAX (804) 752-4724
e-mail: gspagna@rmc.edu http://www.rmc.edu
-----Original Message-----
From: SSHS KPHOX [mailto:kphox@MAIL.CCSD.K12.CO.US]
Sent: Tuesday, February 04, 2003 12:34 PM
To: PHYS-L@lists.nau.edu
Subject: Interference and parallel plates
I have been trying to show the interference pattern between two parallel
glass plates which has one end separated by a thin foil. I am supposed to
use monochromatic light. The closest I have for that is one of the LED
Lights i bought at the hardware.
I could use some guidance on what light does work or any other tips that
will make this work. The paper that came with these plates makes it sound
so easy.