50.0 MB (8.3 MB compressed)
5008 x 3490 pixels
42.4 x 29.5 cm ⏐ 16.7 x 11.6 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Spectrum of light experiment. 19th-century illustration of a method of obtaining a spectrum of colours from sunlight. A beam of light allowed in through a slit (left) is passed through a lens and then a triangular prism (centre). This disperses and refracts the light. Different colours of light refract more than others, producing a spectrum of colours that is displayed on the screen at right, the same colours seen in a rainbow. This illustration is from 'Physique Populaire' (Emile Desbeaux, 1891).
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