GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Compact fluorescent lightbulb observed through a diffraction grating. Here a compact fluorescent lightbulb is photographed through a diffraction grating. The right image is formed by non-diffracted light and has a white neutral colour. The left image is formed by light diffracted into the first diffraction order and exhibits spatial dispersion or decomposition of light into spectral components. Compared to incandescent lightbulbs, fluorescent light bulbs are generally several times more efficient. They typically use mercury vapor and need to be properly disposed of.
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