A triangular prism was set up so that a laser could shine through it onto a blank wall. First, the point where the laser hit on the wall without the prism was recorded. en water was poured into the prism, and the point on the wall was recorded again. A known amount of sodium chloride (to reach a specic salinity) was added and the new point was recorded. is was repeated six times with increasing amounts of salt. Each time the water was drained, new room-temperature water was added, and the measurement of the refracted point noted. e process was then repeated another three times, this time varying the water temperature instead of the salinity. Aer the data was recorded, the index of refraction was calculated using trigonometry and Snell’s Law.
4 Detailed Procedure
Make the prism:
Glue the three smaller squares together (edge to edge, at a 60°
angle) with acetone to make a triangular shape. Duct tape the edges to add extra security.
2. Use the acetone to attach the triangle to the bigger square, which will be the base.
3. Aer the acetone has dried, use the caulking around the base to ensure that water will not leak out.
4. Let dry overnight before adding water.