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What is the alternate name of amplitude grating?

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What is the alternate name of amplitude grating?

(a) Ronchi ruling

(b) Prismatic grating

(c) Phase grating

(d) Index grating

I had been asked this question in homework.

This intriguing question originated from Scales and Gratings in portion Measurement by Light-Wave Interference of Engineering Metrology

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Correct option is (a) Ronchi ruling

The explanation is: Grating which has plane lines is called amplitude grating or Ronchi grating. It is a constant interval bar with equal line and space pattern. These are generally used for optical testing purposes and metrology applications.

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