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Which of the following used moire gratings for angular measurements?

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Which of the following used moire gratings for angular measurements?

(a) Laser interferometer

(b) Microptic autocollimator

(c) Precision polygons

(d) Goniometer

The question was posed to me during an internship interview.

Enquiry is from Optical Instruments for Angular Measurement in division Angular Measurement and Circular Division of Engineering Metrology

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Best answer
The correct choice is (d) Goniometer

The best explanation: Goniometer constitutes the continuously rotating Moire gratings for angular measurements with high accuracy. Two radial gratings are employed in goniometers which are rotating in unison.

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