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How many auto-collimators are required for comparison method of calibration of polygons?

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How many auto-collimators are required for comparison method of calibration of polygons?

(a) 1

(b) 2

(c) 3

(d) 4

I got this question in homework.

The query is from Calibration of Polygons topic in section Angular Measurement and Circular Division of Engineering Metrology

1 Answer

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Best answer
The correct choice is (a) 1

Best explanation: In comparison method of calibration of polygons, two polygons which are identical to each other and one table which can rotate is used. For viewing purpose a single autocollimator is used.

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