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What is the length of Prismatic grating?

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What is the length of Prismatic grating?

(a) 500 mm

(b) 400 mm

(c) 300 mm

(d) 200 mm

I have been asked this question in an interview.

My question is based upon Scales and Gratings in chapter Measurement by Light-Wave Interference of Engineering Metrology

1 Answer

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Right choice is (d) 200 mm

Explanation: Prismatic grating is also known as phase grating. Prismatic grating contains triangularly shaped and contiguous grooves. Prismatic grating has 100 to 200 grooves and its length is limited to 200 mm.

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