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Which of the following is of more important in case of Type-B optical flat?

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in Engineering Metrology by (829k points)
Which of the following is of more important in case of Type-B optical flat?

(a) Thickness

(b) Diameter

(c) Length

(d) Area

The question was posed to me during an online exam.

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

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Best answer
Right choice is (a) Thickness

The best I can explain: For optical flats of Type-A, grades and optical flats are important that means it is usually designated by these two and for Type-B, thickness and grades are important, therefore it is designated by these two.

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