Question

What is the relation between angle of two autocollimators (R) and angle between polygon faces (P) when polygon is calibrated? (R1, R2 are the readings.)

(a) P = R + (R1+R2)

(b) P = R + (R2-R1)

(c) P = R – (R1+R2)

(d) P = R – (R1-R2)

I have been asked this question during an interview.

I need to ask this question from Calibration of Polygons topic in chapter Angular Measurement and Circular Division of Engineering Metrology

Answer 1

Right option is (b) P = R + (R2-R1)

The best explanation: The angle between two polygon face is P and between two autocollimators is R. Readings are taken by using autocollimators let readings are R1 and R2. Then the angle between polygon face is equal to autocollimator angle plus difference in readings.