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What is the alternate name of constant deviation prism?

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What is the alternate name of constant deviation prism?

(a) Optical square

(b) Dowell prism

(c) Circular prism

(d) Reflector prism

This question was posed to me in quiz.

My enquiry is from Optical Instruments for Angular Measurement topic in section Angular Measurement and Circular Division of Engineering Metrology

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The correct option is (a) Optical square

For explanation I would say: Constant deviation prism is also known as optical square. The special property of optical square is that it always reflects the ray through the same angle, which means doesn’t depend on the angle of incident.

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