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    How do I find it , I have the value of D ( distance from grating to screen). On my information sheet it says d = 1/number of lines per metre.
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    Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

    You can also find the Exam Thread list for A-levels here and GCSE here. :dumbells:


    Just quoting in Puddles the Monkey so she can move the thread if needed
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    (Original post by Puddles the Monkey)
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    Normally the question would say the grating is say "300 lines per millimeter", meaning you would do (1x10^-3)/300 to get the slit spacing, or solve for a in lambda = aX/D
 
 
 
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