Question

Shine a flashlight through a clear drinking glass. Try to make a visible spectrum in the image made from the glass. If you can, note the conditions necessary for the spectrum to occur – specifically the distances or angles necessary.

When shining the light through the drinking glass, why was a spectrum not visible all of the
time? What factors would change whether a spectrum is visible, and why?

Answer 1

The glass has a certain color. And so it misses not the whole spectrum, but only the color that it has. Glass absorbs all other colors.