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Refraction question

  1. Oct 20, 2014 #1
    1. The problem statement, all variables and given/known data
    Light travelling thorugh air is at incident at point x on the block of ice. If the refractive index is 1.3, calculate
    a) the critical angle at the ice-air interface (3 marks)
    b) the minimum angle of incidence, for the light to Y refracted out of the block at any point along the top surface (7 marks)

    2. Relevant equations


    3. The attempt at a solution
    a) sin(θc)=1/nm
    θ= sin-1(1/1.3)
    θ= 50.3 (1 d.p)

    is this right?

    b) Need help on this one
     
  2. jcsd
  3. Oct 20, 2014 #2

    NascentOxygen

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    Staff: Mentor

    (a) is right.

    For (b) there's a diagram to accompany it?
     
  4. Oct 20, 2014 #3
    yep it is in the file i uploaded
     

    Attached Files:

  5. Oct 20, 2014 #4
    thank you for helping btw :)
     
  6. Oct 20, 2014 #5

    NascentOxygen

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    Staff: Mentor

    I can view only jpegs, sorry.
     
  7. Oct 20, 2014 #6
    Managed to turn it into jpeg
     

    Attached Files:

  8. Oct 20, 2014 #7

    NascentOxygen

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    Staff: Mentor

    I was anticipating there'd be a point Y. I find there is not.

    Perhaps you meant to type
    b) the minimum angle of incidence, for light to be refracted out of the block at any point along the top surface?

    If so, start by drawing a large diagram with all straight lines (e.g., by using a ruler).

    By "any point" I think they don't mean "every point", just at least some point.
     
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