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Geometrical optics #3

  1. Apr 12, 2014 #1
    In the following diagram find the distance d if a=4.0 mm, Θ=30°

    n_asinΘ_a=n_bsinΘ_b: snells law
    a^2+b^2=c^2: pythagorean theorem

    I think I got the angle to the problem correct. I am not sure if this is correct. Is this correct Θ_b=sin^-1(1sin30/1.52)?
     

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  2. jcsd
  3. Apr 12, 2014 #2

    NascentOxygen

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    That will give you the internal angle.

    You are apparently required to find the offset distance, d, of the emergent ray.
     
  4. Apr 12, 2014 #3
    thank you. How do you find it?
     
  5. Apr 13, 2014 #4

    NascentOxygen

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    Using geometry. Specifically, the geometry of right-angled triangles.

    You start by drawing a large clear diagram, and using a straight-edge to make all your straight lines look straight. Any lines you draw can be made into a side of a right-angled triangle.
     
  6. Apr 13, 2014 #5
    okay, I still don't see it.
     
  7. Apr 13, 2014 #6

    NascentOxygen

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    Staff: Mentor

    Where's your diagram?
     
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