In my high school astronomy class, I will be discussing light and spectra
soon. I wish to do a lab/activity where students can analyze various light
sources with a diffraction grating. It is easy to show continuous spectra
with a candle or light bulb, and emission spectra with gas tubes. I am
looking for a way to show an absorption spectrum. In the past I had
students use colored filters to cover an incandescent light bulb. This
sort of mimics the atmosphere of a star.
Does anyone have other ways to show absorption spectra using simple