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To be honest, the slide is too dark for me to see
any definitive patterns under normal lighting. They do show up well in
scans. Rescanning the slide consistently produced the same
pattern. As I mentioned in the linked web page, I even flipped the slide
and scanned it. The pattern flipped right along with it.
So Newton rings can be caused by imperfections
WITHIN the film?!
Tom
It looks like Newton rings caused by two surfaces that are almost exactly parallel, but not quite flat. Two sides of the film, perhaps are almost parallel? Can you see it when you hold the slide under a fluorescent light? Roland Christen |