For instance, placing a blue transparent folder in front of a desk lamp, makes the light that shines through it appear blue.
From what I understand some red car lights do not have red light sources, but just that red cover on top.
How exactly does placing a color filter of sorts in the path of a light source affect the light that passes through it, other than changing the color that we perceive? I'm thinking the intensity drops, and there might be polarization but I am not sure. Is there anything else?
Also, how exactly can you determine the color of a light source, because from what I understand we may perceive a color different than it is?
I'd appreciate a link to a place where I could read more on this or an introduction to terms I missed out on.
Any help is appreciated! Thanks!