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Solar cell interference filter

  1. Apr 18, 2015 #1
    1. The problem statement, all variables and given/known data
    See attached image, assignment a)
    2. Relevant equations


    3. The attempt at a solution
    Using ordinary trigonometry, I got simply $$\Delta = sin(\theta_i) 2 d tan(\theta_t) n_{air} - 2n_{oxide} d/cos(\theta_t)$$. However, even if I apply Snell's law, it's not the answer I'm supposed to get according to the assignment. So what's happening?

    The two lower triangles with the angle ##\theta_t## are identical, right?
     

    Attached Files:

  2. jcsd
  3. Apr 18, 2015 #2

    mfb

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    Staff: Mentor

    I agree with your answer.
     
  4. Apr 18, 2015 #3
    OK I'll send the professor an email. might be that the TA who made this exercise did a mistake
     
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