- #1
gigli
- 11
- 0
Homework Statement
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?
https://www.physicsforums.com/attachment.php?attachmentid=15094&stc=1&d=1219187822
Homework Equations
Snell's law:
nisin[tex]\theta[/tex]i=nrsin[tex]\theta[/tex]r
n=index of refraction
[tex]\theta[/tex]=incident angle from normal
n plastic=1.70
n air = 1.00
The Attempt at a Solution
According to Snell's law:
(1.70)*sin(33)=(1.00)*sin([tex]\theta[/tex])
0.92588636=sin([tex]\theta[/tex])
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?