- White light reflected off the surface of a soap film creates a random interference pattern with all the colors of the rainbow.
- Can be projected onto a screen or whiteboard.
- Room must be dark.
(put 25 cm lens 28 cm from hoop to make a 40 cm image at 2 m
27 cm from hoop to make a 70 cm image at 3 m
26 cm from hoop to make a 100 cm image at 4 m)
(put 50 cm lens 53 cm from hoop to make a 125 cm image at 11 m)
