PIRA: 6F10.20 


Lab Equipment  Directions
  1.  bulb with 3 colored filters around it
  2. diffraction gratings
  3. variac
  1.  Turn on the bulb and look at the bright white strips of lights through a grating.
  2. There are 3 darker strips interspersed between the bright ones. Comparing the first darker strip (red filter) with a bright one, you should see only red part of the spectrum, blue and green are missing. The next dark strip (blue filter) will show only blue, missing red and green parts, and likewise for the green.