Many printed color pictures are not solid color at all, but rather a sea of dots in three or four different colors. You will explore how the process works in this activity. Funny things happen when colored lights cast shadows. You will use a simulation of such lights to see how this works. Stellar Spectra .
Astronomers can look at starlight and tell what the star is made of.
You will look at light, separated into a spectrum, and figure out the elements from the spectral lines you see.