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Which of the following is not true for angle dekkor?

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Which of the following is not true for angle dekkor?

(a) It is a type of autocollimator

(b) It can be used as a comparator

(c) It is a more precise instrument than autocollimator

(d) It has a wide field of application without the operation of a micrometer

This question was addressed to me during an internship interview.

This question is from Optical Instruments for Angular Measurement in chapter Angular Measurement and Circular Division of Engineering Metrology

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Right option is (c) It is a more precise instrument than autocollimator

For explanation: It is a type of collimator and contains a small illuminated scale. The instrument measures by comparing the readings obtained from a standard. This is less precise instrument than autocollimator but it has wide field of application for general angular measurement.

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