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: Refraction of Light in a laser beam

  1. Mar 12, 2006 #1
    A laser beam travels from air into a symmetrical prism at right angles close to its upper edge. The refractive index of the prism material n = 1.4 and its angle is 30 degrees.

    Calculate the critical angle for the prism-air interface.
    Possible Answer:
    Critical angle = arcsine(1/n)
    = 45.585 degrees

    After passing through the prism, what angle does the beam make with the incident ray?
    Possible Answer:
    Sine Angle = (n of prism)(Sine30)/n of air
    = ((1.4)(Sin30))/1.0
    Sine Angle = 0.7
    Angle = 44.427 degrees

    Are these correct?
  2. jcsd
  3. Mar 12, 2006 #2
    n = sin(A/2 + x/2)/sin(A/2). Here critical angle is x. 2 is correct.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook