Which of the following is true for automatic position sensing autocollimator?
(a) Accuracy is affected by normal mains fluctuations
(b) There is no effect of lamp ageing on the accuracy of this instrument
(c) Instrument measure in all planes simultaneously
(d) It is not ideal for the repetitive checking
I had been asked this question during an interview for a job.
The doubt is from Optical Instruments for Angular Measurement in chapter Angular Measurement and Circular Division of Engineering Metrology