While human vision is remarkable, it isn't very analytical. Although not apparent to the unaided eye, the light emanating from a white incandescent bulb or fluorescent lamp consists of many colors and, in some instances, virtually every color in the rainbow. Likewise, direct viewing of light from a neon sign doesn't reveal its rather complex structure. Observing light's constituent colors requires the use of a prism or diffraction grating, components found in a device known as a spectroscope.
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