Prisms
with filtered light
If you
shine light into a prism it disperses.
If you place a red
filter in the path of the light it only lets the parts of the spectrum
that contain red light through and absorbs the others.... mouseover to
see the effect!
Blue filter
Green filter
When you put a secondary
colour filter in the path of the ray you get more light allowed thorugh.
The two colours can pass through so the light that is made up of two colours
is seen as well as the primaries that the filter lets through.
Yellow Filter
Cyan filter
Magenta filter