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NEWTON AND THE COLOURS OF THE SPECTRUM
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absorbed appear arrangement atomic number atomic weights bright candle candle power carbon cell chlorophyl colour blindness colour photography colour vision coloured thinkers complementaries consequently crest density described diameter different colours disc distance effect electric electrons emission theory energy example experiment exposure filament film filter fluorine Gamboge gelatine give glass glow lamp green heat rays illuminated inches indigo infra-red invisible rays lantern length lens lenses light falls light wave magenta matter means ment mercury method millimetre mirror mixing musical scale nature negative Newton objects obtained optical orange ordinary particles passes peacock blue photographic plate picture plane positive primary colours prism produced radiation reflected represents result screen selenium sensitive shade silver chloride skin slit sodium sodium fluoride spectra stars superimposed telescope temperature tetrachord trough tube ultra-violet vibrations violet end visible spectrum wave-length X-rays yellow Young-Helmholtz theory