Monochromatic Light and a 30-60-90 Prism Problem

  • Thread starter hawaldko
  • Start date
  • #1
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Homework Statement



Red light is incident in air on a 30o - 60o - 90 o prism as shown. The incident beam is directed at an angle of φ1 = 34.3o with respect to the horizontal and enters the prism at a height h = 26 cm above the base. The beam leaves the prism to the air at a distance d = 77.2 along the base as shown.

http://imgur.com/O9jZg

Image link: http://imgur.com/O9jZg

Homework Equations


Snell's Law


The Attempt at a Solution



So basically, I am getting really hung up with the geometry. I just can't figure out how to find angle 2. I've tried a couple of different triangles, and every useful one I come up with I can't solve and everyone I can solve, doesn't give me anything useful. My teacher said: "My suggestion is to focus on finding the second angle using geometry. My hint is to focus on h, which represents the distance from the point where the beam enters the prism to the bottom of the prism." I have literally been working on this for the past 2 days and I can't see what triangle to use.
 

Answers and Replies

  • #2
66
15
please show the work you've completed so far.
 
  • #4
66
15

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