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Physics AS question! Diffraction gratings!

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
    • Thread Starter

    Jsut one question

    With diffraction gratings you get orders right?
    So between the first order and zero order the angle is theta.
    Is the angle between the first order and second order also theta?
    If this is true then is the angle between second order and zero order, 2 theta?
    HELP! Its really silly but I jsut need an answer

    I'm assuming you know the equation nλ=dsinθ . When n represents the gap between the orders. So between orders 0and 1 n=1, between orders 0 and 2 n=2, and so on... Now answering your question, between orders e.g 4 and 5 n=1 because there is a gap of one order between them. This allows you to find θ when you don't know what number the orders given to you are (although you do know they are consecutive).
    So based on this, you are right!
    Hope this helped a little, but I'm tired, so apologies that it's not the clearest explaination! 😃

    NO, think about it. The length of the height between the order changes whilst the distance from the grating to the wall is unchanged. So the angle changes. Theta is different for each order, n , is used to compromise for this.

    I edited some of my message, some sp mistakes.

    if the distance between n=1 maxima and n=2 maxima = n=0 maxima and n=1 maxima then yes, you will be right.
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