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    Why are two spectra observed in a diffraction grating?
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    is this AS AQA physics?
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    (Original post by Custardcream000)
    Why are two spectra observed in a diffraction grating?
    like light and dark patches? That's because waves interfere constructively at the light areas and destructively in the dark areas
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    (Original post by thefatone)
    like light and dark patches? That's because waves interfere constructively at the light areas and destructively in the dark areas
    no like white light, so there would be two violet, blue etc
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    (Original post by Custardcream000)
    no like white light, so there would be two violet, blue etc
    because each side is a mirror of the other
 
 
 
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