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What is the range of line spacings in gratings?

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What is the range of line spacings in gratings?

(a) 4 to 200 per mm

(b) 200 to 400 per mm

(c) 10 to 500 per mm

(d) 500 to 600 per mm

I got this question in semester exam.

Question is taken from Scales and Gratings in section Measurement by Light-Wave Interference of Engineering Metrology

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Correct answer is (a) 4 to 200 per mm

Best explanation: Gratings plays an important role in rotary as well as linear measurements. Gratings have line spacing from 4 per mm to 200 per mm in lengths up 4 meters or so. These are usually employed with photoelectric readouts.

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