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Why Glass For Mirror?

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Posted by Chris Blight on September 19, 2001 17:46:14 UTC

Some friends and I want to make our own telescope.
We`re Engineers, newbies to telescope making, and want to know why you have to use glass to make a mirror when it is coated with aluminium anyway?

I`m sorry if this has been covered before but I couldn`t find a post that said.



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