Question

Which of the following is not true for autocollimators?

(a) Has an infinity telescope

(b) Has an autocollimator

(c) For smaller angle it is not accurate

(d) Very high sensitivity

I got this question in an interview for internship.

I'd like to ask this question from Optical Instruments for Angular Measurement topic in chapter Angular Measurement and Circular Division of Engineering Metrology

Answer 1

Right answer is (c) For smaller angle it is not accurate

To elaborate: Autocollimator is an optical instrument which is used for the measurement of small angular differences. Autocollimator provides a very sensitive and accurate approach for small angular measurements. Autocollimator is an infinity telescope and a collimator combined into one instrument.