Normal mirror glass will not work as the mirror surface is on the back of the glass. Telescope mirrors are first surface so the mirrored surface is in the front of the glass. Technically difficult but necessary.
Go to any amateur mirror making site such as Bartels or download a book and the geometry will be made clear.
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Originally Posted by legswilly
Hello. This is my first post and I have two questions.
Is there a mirror maker in the Port Macquarie/Wauchope area? I hope to get come information on testing equipment and tests.
Why are the secondary mirrors on reflectors made an oval shape? The reflection from the primary mirror creates an oval shape on the seconday, it being at 45deg angle. Could a round mirror, or even a rectangular or square one of sufficient size be used and would it be cheaper to make? Has anyone tried to use a piece of a normal mirror like a bathroom one?
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