From: scerir (scerir@libero.it)
Date: Fri Aug 30 2002 - 01:54:04 MDT
Martin Hogbin writes:
Hold two fingers close together about 20 mm from
your eye and look through the space between them at
a light background. As you bring your fingers together
so that they are almost touching you will see a series of
light and dark bands. What causes this?
I feel sure that the effect must be well-known, but
so far nobody has been able to explain it to me or
even give it a name.
I am convinced that this is not an interference effect
for two reasons, Firstly, the spacing between the
bands does not vary in an appropriate way when the
distance between the fingers is changed. Secondly
there is no colour fringing with white light.
The effect is even more noticeable if you look
through a pair of vernier callipers with the jaws
almost touching.
=============================
http://personales.ya.com/carlosla/bands/h_bands.htm
[Nobody knows the answer. But they have nothing
to do with Mach's bands. The effect here is real,
physical]
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