Re: [ATM] convex secondary

[Mike Lockwood <melockwo@uiuc.edu>]

Jonathan,

Jonathan Lavoie wrote:
>> I've heard of using Glycerin, because it matches the index of 
>> refraction of Pyrex.
>> Seems like if you polished the front and back of the tool and the 
>> secondary and then put the two together with glycerin between (flat 
>> surface to flat surface, so that the curved surfaces were facing out) 
>> then you could test through the tool and mirror with minimal 
>> refraction.  This is either the test I'm remembering, or it's close to 
>> this.  I don't know how much of a problem testing through the Pyrex 
>> would be.
> 
> At 5:00 am this morning I was not able to sleep then your idea became 
> clear in my mind.
> I sketched it here: http://www.lavoielactee.net/images/convex.gif
> I think this looks like the test I read about but still can't find where.
> 
> What other think of this idea? Would this arrangement enable me to test 
> with no need to account for any refraction effect?

It might work as you have it pictured.  My thought was to have the two 
pieces of glass in contact, so that the glycerin layer was thin.

There are good writeups on several convex mirror tests in The Best of 
the ATM Journal, in volume 2 I believe.  (Richard suggested vol 1., 
but he might be right).  Here's a link to the table of contents, on 
the Willmann-Bell site:
   http://www.willbell.com/tm/batmj/BATM-2-TOC.PDF

I think it's section 14.8.  I'll have to check the book at home to 
make sure I'm right.

Both volumes are goldmines of articles and ideas.

	Mike

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