THE MENLO ROUNDTABLE
Figure 1: Laser and prism position 
Position the laser and prism as shown in Figure 1. e laser
should shine perpendicular to the wall. e larger the distances between the wall, prism, and laser the easier it will be to see a change in the refraction. Secure the laser so that it does not move during the experiment.
2. Remove the prism from the setup. Shine the laser and mark where it lands on the wall. is is the origin. Replace the prism in its spot, but on top of a piece of paper, and tape it down so it remains stationary.
3. Check to make sure that the laser’s point is still shining on the same spot (while the prism is down), but mark it if it has moved.