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can anyone help me with this please? Watch

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    if you have two slits emitting coherent sources of light
    and if that light diffracts
    and you get a pattern of constructive and destructive interference...
    what happens if you block one of the fringes?
    also, why does a single slit produce a bright central fringe which is twice as wide as the other fringes?
    ty
 
 
 
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