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For how much travel length, metal reflecting gratings are used?

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For how much travel length, metal reflecting gratings are used?

(a) 600 mm

(b) 900 mm

(c) 1700 mm

(d) Greater than 1800 mm

The question was asked in a national level competition.

The query is from Scales and Gratings in division Measurement by Light-Wave Interference of Engineering Metrology

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The correct choice is (d) Greater than 1800 mm

Explanation: Three types of gratings are commonly used in more fringe system gratings. Phase transmission grating, Metal reflecting grating and line and space transmission grating. Metal reflecting grating is used for travel length more than 1800 mm.

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