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Re: [ATM] No fringes
>I doubt a green 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.
LED spectra are about 30 nm at half intensity points,
similar for green, red and blue.
I do not think that monochromaticism of LEDs is a problem.
It is its size. Usually Newton ring interferometers are shown with
broad (large surface) light sources (like fluorescent lamps behind
diffuser).
Regards
Vladimir.
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