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Hi Rob,
don't misunderstand my comment about the physicist: like most I know, he will definitely and genuinely be pleased to learn something new. He is a very fine teacher and is always open to new ideas and willing to learn. That's why he's so good at what he does.
I have seen the website you suggested and this is the design I made up the other day. I could not see the absorption lines, however. I'll try again. I assume the secondary spectrum is the one to look at? The primary is too glaring to see anything. Should I use reflected light? Do I focus on infinity or on the CD?
Thanks,
Geoff Mc
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