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Homework Help: Snell's Law and critical angle

  1. Apr 28, 2009 #1
    1. The problem statement, all variables and given/known data

    The critical angle of a certain plastic in air is 37.3 degrees. Wats the critical angle of the same plastic if its immersed in water?

    2. Relevant equations

    n1sin( theta)= n2sin(theta)

    3. The attempt at a solution
    Nair= 1.00
    1.00sin37.3/1.33 = sin(theta)
    sin(theta)= .455
    inverse sin (theta) = 27.1 degrees

    Is that right?
  2. jcsd
  3. Apr 28, 2009 #2
    No. I think it should be:
    << complete solution deleted by berkeman >>
    Last edited by a moderator: Apr 28, 2009
  4. Apr 28, 2009 #3


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    Staff: Mentor

    Please do not post complete solutions to homework/coursework questions. Instead, provide hints and tutorial advice. The original poster (OP) must do the buld of the work. The Rules link at the top of the page explains how we treat homework here on the PF.
  5. Apr 28, 2009 #4


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    Homework Helper

    What is the relation between the refractive index and the critical angle?
    Find the refractive index of the plastic.
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