How many slits per centimetre does a grating have if the third order occurs at a 15 0 angle for 620 nm light A B C D 1580 cm

Question

How many slits per centimetre does a grating have if the third order occurs at a 15 0 angle for 620 nm light A B C D 1580 cm approx 1130 cm approx 1390 cm approx 1240 cm approx O A O O B C

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