00:03
All right, so i don't have access to the gizma that you're doing, but i do remember my students doing this gizmo where you put a prism.
00:13
I believe you're using one that you can vary the width of the prism.
00:20
So i'm just making my prism into a triangle, and i'm having the laser go in and at a different spot, different location on the prism.
00:31
So if you notice when we're close to the top where the thickness of the glass is very small, when the red laser goes in, it doesn't have as much time to be maintaining that slower speed.
00:47
And so when it comes back out, the difference between where the beam was before and where it is now is as much.
00:54
But if we go down farther, notice how it has to travel through the glass even further.
01:01
And so it has that angle bend that it's going to go to until it hits the other side and then come back parallel.
01:09
So it went in parallel bent.
01:11
And these are the same angles.
01:13
This angle here and this angle up here are the same.
01:16
The difference is the amount of time that it's traveling through the glass.
01:22
Yes, it's not very much, but it's enough that it's causing it to be farther down on the glass prism than before.
01:30
So notice the gap difference between where they were and where they are now.
01:36
So the larger the prism is in terms of its width, the more time that that light is spinning at the slower speed.
01:46
Remember, a fraction changes the speed.
01:51
The more glass, more change in speed for a longer period of time...