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Homework Help: Reflection/Refraction homework help

  1. Jul 26, 2008 #1
    1. The problem statement, all variables and given/known data

    A light ray is incident on a glass prism with n=1.65. (A) If the prism is immersed in air, where does the light ray emerge into the air? At what angle? (B) If the prism is immersed in water, where does the light emerge into the water? At what angle?

    _____ A_____C
    _____ |90 45/
    _____ |____/
    _____ |n /
    _____ B /

    2. Relevant equations
    n_a sin(theta_a) = n_b sin(theta_b)
    sin(theta)critical= n_b/n_a

    3. The attempt at a solution

    PART A:

    1.0 sin(0)= 1.65 sin(theta)'
    (theta)'= 0 (no bending)

    BC) (crtitical angle 41.1 in air???)
    1.65 sin 45 = 1.52 sin (theta)'
    (theta)'= 50.14 <- final answer

    PART B:
    just change the n's?

    Any good?
    Last edited: Jul 26, 2008
  2. jcsd
  3. Jul 26, 2008 #2


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    Science Advisor
    Homework Helper

    Re: Reflection/Refraction

    B, yes n for water is around 1.3
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