(adsbygoogle = window.adsbygoogle || []).push({}); How much will a ray be "deviated"?

So my terrible phys prof presented this question but failed

to answer it and I have become very curious of the answer

after failing to answer it several times.

Here is a quick paint drawing of my question:

http://img17.imageshack.us/img17/8624/deflection.jpg [Broken]

Uploaded with ImageShack.us

A "blue" light ray passes through glass of thickness T. The entry

and exit angles are the same, but it is "deviated' by a difference

"x" as i tried to show in the figure. This distance is the distance from

the two parallel green lines. This is not in my textbook, but my prof

just said it is approximately the thickness T times the sin of the incident

angle. The textbook does not have this. Does anyone happen to know

this or know how to quickly prove this? thanks so much in advance.

Cheers

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# How much will a ray be deviated ?

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