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    https://gyazo.com/8bf6d759834c7ec2cca480891db6f4b0

    I got A and C but the markscheme says C only any explanations?
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    I also need help,

    In general can someone say what happens when the slit is smaller, and what happens when the slit is karger?
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    (Original post by Xenon17)

    https://gyazo.com/8bf6d759834c7ec2cca480891db6f4b0

    I got A and C but the markscheme says C only any explanations?
    The angle of the first order beam will have a sine which is half of the sine of the second order beam. It is the sines that will halve, not the angles.
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    (Original post by Pangol)
    The angle of the first order beam will have a sine which is half of the sine of the second order beam. It is the sines that will halve, not the angles.
    Yes with that in mind i still get A and C
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    (Original post by Xenon17)
    Yes with that in mind i still get A and C
    Halving angles \not= Halving \sin{\theta}
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    (Original post by Xenon17)
    Yes with that in mind i still get A and C
    maybe you're thinking about a small angle approximation.
    halving sin (Θ) implying halving Θ is a good approximation... but only when Θ is a small angle, the question doesn't say anything about the size of Θ (and the diagram doesn't make Θ look small tbh)
 
 
 
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