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Double-slit problem with incident and refracted angles

  1. Apr 9, 2016 #1
    1. The problem statement, all variables and given/known data
    For the given configuration, the path difference between the 2 rays is given as δ=dsinθ1 - dsinθ2

    Capture.JPG

    2. Relevant equations
    Small angle approximation?

    3. The attempt at a solution
    I'm used to seeing a double-slit situation where only the exit angle is specified, and thus path difference is simply δ=dsinθ. Here, though, we have an incident and refracted θ1 and θ2. Any hints at deriving the following will be appreciated:

    δ=dsinθ1 - dsinθ2
     
  2. jcsd
  3. Apr 9, 2016 #2
    Here's a question for you, why do you think one term is positive while the other is negative (i.e. what does it mean physically)?
     
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