Diffraction grating AQA A level physics

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Derivation of diffraction grating formula + use of it.

AQA A level specification - post 2015

Music: TheFatRat - Unity
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Hi, i was just wondering why they say there is 300 lines per mm. Is 300 random or does it mean something because why couldnt it be 200 or 400 etc?

inessa
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hi I just had a question, when you said that there are 300 lines (slits) per mm wouldnt that mean that there are only 299 gaps, so wouldnt you have to divide by 299 and not 300?

eeshmishra