Homework Help: physics

Posted by help? on Saturday, May 24, 2008 at 1:03pm.

A laser beam enters a .125 m thick glass window at an angle of 39° (from the normal). The index of refraction of the glass is 1.46. At what angle from the normal does the beam travel through the glass? that answer is 25.53 deg

the second part asks
How long does it take the beam to pass through the plate?

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