If there are 1500 slits per mm, what is the distance between each slit?
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1500 slits per mm means 1500/1500 slits per 1/1500 mm
i.e.1 slit per 1/1500mm
= 1 slit per 6.667*10^-4 mm.
Distance between each slit = 6.667*10^-4 mm
i.e.1 slit per 1/1500mm
= 1 slit per 6.667*10^-4 mm.
Distance between each slit = 6.667*10^-4 mm