Which material should be chosen to make the concave mirrors of a high resolution telescope so that it can also withstand temperature variations?

Quartz

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Flint glass

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Crown glass

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Combination of Flint and Silica

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Solution

The correct option is A Quartz
Quartz makes an ideal mirror. Its high hardness results in the smoothest micropolished surface possible, and its thermal dimensional stability allows the optician to produce a flat surface with almost no edge defects.

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