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Upto which value optical bevel protractor can take the readings?

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Upto which value optical bevel protractor can take the readings?

(a) 10’

(b) 5’

(c) 2’

(d) 15’

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This interesting question is from Vernier and Optical Bevel Protractor in division Angular Measurement and Circular Division of Engineering Metrology

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Best answer
Right option is (c) 2’

To elaborate: Circular graduations can be viewed by a small microscope which is fitted on it. It is possible to read by estimation to about 2 minutes of arc with the help of microscope in optical bevel protractor.

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