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What is the range of the diameter of optical flats used in testing the flatness?

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in Engineering Metrology by (829k points)
What is the range of the diameter of optical flats used in testing the flatness?

(a) 25mm to 300mm

(b) 1mm to 100mm

(c) 50mm to 500mm

(d) 1mm to 10mm

The question was asked in an online quiz.

This interesting question is from Flatness Testing topic in division Straightness, Flatness, Squareness, Parallelism, Circularity and Rotation of Engineering Metrology

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The correct choice is (a) 25mm to 300mm

Easy explanation: Size of optical flats used varies from 25mm to 300mm diameter. The range is selected to get a proper interference pattern using light.

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