February 19, 2017

Homework Help: Physics

Posted by Katie on Sunday, May 31, 2009 at 4:01pm.

I don't understand snell's law ( nsin(0)=nsin(0) ) and how to use it with refraction.

also how do i apply that to this problem:
'a light ray enters a square piece of plastci (n=1.39) near a corner. as it encounters the adjacent side it gets refracted along the surface (it hits at the critical angle). what was the original angle with which the ray hit the plastic from air?'
i know the answer (75 degrees) but i don't know how to get there.
please help!

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