Proving a light ray exits parallel after passing through a medium

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Arowana
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hi, i know that the entry ray of light into a medium will exits parrallel to the entry ray. The problem ask me to prove it. i have drawn a diagram and done the mathematical calculation. i just can't put it into words, could some one please help me out.


and 2nd part to that question is

Derive an expression for the offset of the entry and exiting rays if the
thickness of the sheet is T and the ray enters at an angle of incidence of θ.


aaaaaahhh...im so stress out..because of this simple question.
 

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Perhaps, if you could show the mathematical calculation. Will your tutor not accept a proof based on calculations?

For you second part, simply use trig...

~H
 
thanks hootenanny


umm...i still don't get the 2nd part, how do i use trig?
 
Arowana said:
umm...i still don't get the 2nd part, how do i use trig?

Try drawing a diagram and making right triangles with the rays of light as the hypotenues.

~H