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Optics: beam in glass

  1. Sep 8, 2006 #1
    laser beam of dia=D strikes at theta.i an n.t=1.5 glass pane. what is the diameter of the beam in the glass...

    i started by setting up a geometric interpretation of the phenomena and concluded that the light would remain columned and both sides of the beam would simply shift from theta.i to theta.t, where n.t*sin(theta.t)=n.i*sin(theta.i). However, we are covering some of the physical interpretations of optics, such as dispersion and optical path lengths. Considering I'm only 3 weeks into my upperdivision optics class, what aspect of electromagnetic theroy would I introduce into this problem if any? Is it a trick question?... I doubt that.

    Thanks for any help.
  2. jcsd
  3. Sep 9, 2006 #2
    they were just looking for the trigonometric alteration of incident area... deceptivly easy...
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