Binoculars Black

What's the name of that electromagnetic spectrum thingy..?

It's almost like you're looking through some sort of binoculars, with little slits in it and it's black and square, and if you aim it at a traditional incandescent lightbulb, you see the full spectrum of colors it gives off? What's that thing called again? I have used one in school before, but i cannot recall the name!

It's a spectroscope.




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