1. Not finding help here? Sign up for a free 30min 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!

Laser Beam and index of refraction

  1. Mar 14, 2010 #1
    1. The problem statement, all variables and given/known data
    A laser beam enters a 10.0cm thick glass window at an angle of 30 degrees from the normal. The index of refraction of the glass is 1.46. At what angle from the normal does the beam travel through the glass?


    2. Relevant equations
    sin theta 1 / sin theta 2 = n1 / n2 = v1 / v2

    3. The attempt at a solution
    sin (30) / sin theta 2 = 1 / 1.46
    theta 2= 46.89 degrees

    Not sure what I'm doing wrong here? I also tried 90 deg - 46.89 = 43.11 deg but that was also wrong.
     
  2. jcsd
  3. Mar 14, 2010 #2

    ideasrule

    User Avatar
    Homework Helper

    No, sin theta 1 / sin theta 2 = n2 / n1. You can also remember it as n1*sin(theta1)=n2*sin(theta2), which I find easier to use.
     
  4. Mar 14, 2010 #3
    Ah, I see. Thank you!!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Laser Beam and index of refraction
  1. Refractive Indexes (Replies: 11)

  2. Index of refraction (Replies: 5)

  3. Refractive Index (Replies: 5)

Loading...