DO YOU HAVE A WAY TO PLAY THESE MOVIES PROPERLY?

IF NOT, CLICK HERE

Follow the light through the gem, noting the importance of the critical angle

Note that white light enters the gem and, depending upon the refractive index, is bent. The critical angle, marked in red, is determined by the refractive index.

(1) Correctly cut gem: Now, watch the light path. Note the rainbow of colored light, a consequence of dispersion .

(2) Gem is cut too shallow: Note how light leaks from the bottom of the gem . The gem would appear dark and dull.

(3) Gem is cut too deep: Again, note that light passes inside the critical angle at certain bottom facets, resulting in leakage from the bottom of the gem.

Here are some actual examples using a demonstration unit!

(i) Too shallow

(ii) Too deep

(iii) Just right.

DIAGRAM If the cut is too shallow or too deep, the light leaks from the pavillion. Note that the critical angle makes cones, through which light must pass inside of to escape