Re: [ATM] Phase contrast and the 10 incher.

["Arjan te Marvelde" <arjan.te.marvelde@hetnet.nl>]

> Moving the knife is a different thing and that only
> changes the very lower order SA terms that change the
> surface from a bowl, torus, and hill.  The worm
> features remain throught that movement.

So, if the features are so pronounced, I'd expect them to be visible in
shearing light as well. Or has the mirror a coating which has locally
changed composition?

Have you tried the mirror in your interferometer?

About the reflection from the back: light intensity should be much
decreased. Suppose 4% is reflected, then the intensity of backside
reflection is only about 4% of the front reflection. However, I can imagine
that when you cut off most of the front reflection, backside reflections
scattered from artefacts may become visible.

   Arjan

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