GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
White light spectrum. Optical intensity as a function wavelength is called spectral distribution or spectrum. Shown here is the spectrum of white light emitted by an incandescent bulb filament. The spectrum was obtained by decomposing or spatially dispersing white light with a diffraction grating. Note that emission of the incandescent bulb covers visible spectrum continuously.
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