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How many auto-collimators are required when the polygons are calibrated by using only auto-collimators?

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How many auto-collimators are required when the polygons are calibrated by using only auto-collimators?

(a) 1

(b) 2

(c) 3

(d) 4

This question was posed to me in an international level competition.

My question is from Calibration of Polygons topic in division Angular Measurement and Circular Division of Engineering Metrology

1 Answer

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Best answer
The correct option is (b) 2

Easiest explanation: Any precision polygon is usually calibrated by two autocollimators before using, in order to know the errors. For this method, precision polygon is mounted on a table and this table is a rotating table.

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