Solving for Alpha: Optic Axis and Beam Angles in CALCITE Block | 1st Post

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SUMMARY

The discussion revolves around solving a problem involving the CALCITE block's optic axis and beam angles, specifically determining the angle of incidence (Alpha) when a beam of light strikes the surface. The participants express confusion over the complexity of the problem, which involves both ordinary and extraordinary beams, and the application of Snell's Law. The challenge lies in the lengthy calculations required and the potential use of Fermat's Principle to simplify the process. Ultimately, the conversation highlights the difficulties faced in applying geometric optics to this scenario.

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HoangFat
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Well, this is the question from the end term exam of the Optic 1 year 1 ago that I got from the senior, we (me and my friends) get confused. I try to slove this problem by Geometry Optic but the final equation can't slove (if sloved it will be loooooong to slove on the short time). I think abount using Fremat's Principle, but I can't detect the way to mash it.

so :
The CALCITE block with the Optic Axis parallel with the surface,the thickness is H
(ordinary index N and extraordi index Ne
A beam of light trikes the surface at an angel of incidence of Alpha from the vertical., the plane which keep the beam perpendicular with the OA.
2 Out beams,the ordinary beam and the extraordinary beam, parallel with the distant L !

>>Find Alpha

Fig: http://img178.imageshack.us/my.php?image=opticko7.jpg"

Yep, that all !

Hmmm.. This is my 1st post, I hope I didnt post a homework (yeah this is not homework).
And my English is bad T.T
 
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Welcome to PF :smile:

Are you familiar with Snell's Law? I think that will be useful here.
 
Ya ! I used the Snell's law in Geometry Methol, but I think using the wave mothol in sloving,
If you use the Sneel's law you 'll got the unsloveable quation T.T
 

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