Multi Slit interference/ diffraction grating

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    You know when light goes through the diffraction grating, we have to measure the angle... can the angle ever be 90° ?
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    (Original post by Tenzinlhazey)
    You know when light goes through the diffraction grating, we have to measure the angle... can the angle ever be 90° ?
    If you are talking about the angle  \theta described in this website
    (http://www.cyberphysics.co.uk/topics...difraction.htm),

    the answer is no.
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    Thank you for your reply. I still dont understand, how come it can never be 90 degrees?
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    How could it be above 90? There's a wall in the way. The light can't go back through the wall.
 
 
 
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