A light ray enters the plastic block in the illustration at an angle of 33.0° and then exits the opposite side. The long side of the block has a length of 0.670 m and its index of refraction is 1.70. For how much time is the light ray inside the block?
n=index of refraction
[tex]\theta[/tex]=incident angle from normal
n air = 1.00
The Attempt at a Solution
According to Snell's law:
arcsin(0.92588636)=[tex]\theta[/tex] = 67.8023923 degrees
And the speed of light is 2.998*10^8 m/s.
But after that I am not sure where to proceed! Can anyone help me figure this one out?