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    I really dont understand how youre supposed to do this question

    Calculate the number of lines per metre on the grating.

    https://i.gyazo.com/7f4b28a5757ec01c...5b232aeb7f.png

    Edit: nevermind i worked it out, you had to use your answer from the previous question divine by 2.5m, then rearrage d.sintheta = n.lambda for d which is d = (n.lambda/sintheta)
    then take the reciprocal of your answer
 
 
 
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