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Which of the following is the use of Type-A optical flats?

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Which of the following is the use of Type-A optical flats?

(a) Testing parallelism of measuring devices

(b) Testing parallelism of measuring anvils

(c) Testing micrometer measuring surfaces

(d) Testing the flatness of measuring table

I got this question during an online exam.

Asked question is from Optical Flats in chapter Measurement by Light-Wave Interference of Engineering Metrology

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Correct answer is (d) Testing the flatness of measuring table

The explanation: Type-A optical flats are used to test the flatness of slip gauges, measuring tables, precision measuring surfaces of flats. Type-B are used to test flatness and parallelism of measuring surfaces of anvils. Micrometer etc.

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