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What is the standard magnification used by an optical projector to inspect form of profile gauges?

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What is the standard magnification used by an optical projector to inspect form of profile gauges?

(a) 50

(b) 100

(c) 150

(d) 200

The question was posed to me in my homework.

This key question is from Measurements of Limit Gauges in division Testing and Calibration of Gauges and Dynamic Measurement of Engineering Metrology

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Correct answer is (a) 50

Explanation: Profile gauges are most conveniently inspected by optical projection at a standard magnification. The standard magnification mostly used is 50. Another standard magnification which can be used is 100 but it is generally not used due to reduced intensity of illumination at the projector screen, it is generally not greater than 50.

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