1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: At what angle does the light leave the glass?

  1. Mar 29, 2009 #1
    1. The problem statement, all variables and given/known data
    The drawing shows a rectangular block of glass (n = 1.52) surrounded by a liquid with n = 1.60. A ray of light is incident on the glass at point A with a 30.0° angle of incidence. At what angle does the ray leave the glass at point B?


    2. Relevant equations
    n1sintheta1 = n2sintheta2

    3. The attempt at a solution
    (1.52)sin(30) = (1.6)sintheta2
    theta2 = 28.359

    I have no idea what I did wrong.. should the angle be negative??
  2. jcsd
  3. Mar 29, 2009 #2


    User Avatar
    Homework Helper

    theta2 = 28.359
    This is the angle of refraction at point A. From that find the angle of incidence on the surface containing point B.
  4. Mar 29, 2009 #3
    Ohh, is this right then..?

    sintheta2 = (1.6) sin30/1
    theta2 = 53.13
  5. Mar 29, 2009 #4
    Nevermind, I got it :] 53.13 degrees is the answer. Thanks!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook