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mirror blank


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A disk of glass or other suitable material which is to be turned into a mirror. It may be cast as a disk or cut from a sheet. The ratio of diameter to thickness is usually at least 6 : 1 so that the mirror will not deform. Low-expansion glass such as Pyrex is advisable, to prevent distortion of the finished mirror's precise curve as a result of temperature changes.

Subjects: Astronomy and Astrophysics.


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