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What is the range of the diameter of optical flats?

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What is the range of the diameter of optical flats?

(a) 10 to 50 mm

(b) 50 to 100 mm

(c) 100 to 200 mm

(d) 25 to 300 mm

I have been asked this question in a job interview.

My enquiry is from Interferometry Applied to Flatness Testing topic in section Measurement by Light-Wave Interference of Engineering Metrology

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Correct option is (d) 25 to 300 mm

The explanation: Optical flats are the circular pieces of optical glass with a high degree of finish on the working surfaces. Its two plane faces are flat and parallel to each other. Optical flats varies from the size of 25 to 300 mm.

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