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Which of the following is used to make optical flats?

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Which of the following is used to make optical flats?

(a) Toughened glass

(b) Glass wool

(c) Fused quartz

(d) Porous glass

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This interesting question is from Optical Flats topic in portion Measurement by Light-Wave Interference of Engineering Metrology

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Correct option is (c) Fused quartz

To explain I would say: Optical flats are generally made from fused quartz or borosilicate glass as they have the least coefficient of linear expansion. This glass is colourless and free from defects like bubbles, internal strains and extraneous matter.

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