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    Hi there folks, this is my first post but what better way to start than a question about diffraction gratings.
    As I said in the thread title, the particular question thats bugging me is question 6 off the AQA A syllabus, June 2005.
    The question reads:

    ''Light of wavelength λ is incident normally ona diffraction grating for which adjacent lines are a distance 3λ apart. What is the angle between the second order maximum and the straight through position?''

    Its a multiple choice and the answers are:

    a.) 9.6°
    b.) 20°
    c.) 42°
    d.) There is no second order maximum

    Now basically this has me confused, as normally for these questions I would use d SinΘ = nλ but I don't see how that would work?

    Anyway, if any of you kind folk could explain the procedure for working this out, I'd be much obliged. Thanks, Andy x
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    (Original post by Andrew Charlton)
    Hi there folks, this is my first post but what better way to start than a question about diffraction gratings.
    As I said in the thread title, the particular question thats bugging me is question 6 off the AQA A syllabus, June 2005.
    The question reads:

    ''Light of wavelength λ is incident normally ona diffraction grating for which adjacent lines are a distance 3λ apart. What is the angle between the second order maximum and the straight through position?''

    Its a multiple choice and the answers are:

    a.) 9.6°
    b.) 20°
    c.) 42°
    d.) There is no second order maximum

    Now basically this has me confused, as normally for these questions I would use d SinΘ = nλ but I don't see how that would work?

    Anyway, if any of you kind folk could explain the procedure for working this out, I'd be much obliged. Thanks, Andy x
    it does work...

    d=3lambda

    sintheta = n/3

    n=2

    sintheta=2/3

    theta=42
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    :rolleyes:

    Thanks very much. You know the feeling where your just staring at a question and it just doesn't click? Yeah I had this feeling for that question.

    Thanks very much
 
 
 

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