PIRA: 6A40.00


 Lab Equipment  Directions
  1.  3 plastic rulers
  2. Plastic photocube
  3. overhead projector
  1.  Place photocube filled with water to depth d on the overhead. Slide a transparent ruler under the cube and focus the ruler sharply through the water.
  2. Lay the second ruler alongside the cube. Slowly raise that ruler until it also focuses sharply. Measure the distance h that the ruler is elevated.
  3.  d/(d-h) should equal the index of refraction of water (neglecting the small effect of the bottom of the cube).