Dispersion and colour

Appearance of coloured objects in coloured light

Appearance of coloured objects in coloured light A convenient source of light of various colours may be obtained by placing an ordinary electric lamp in a box with an opening which may be covered with gelatine sheets of different colours. By means of such a lamp the appearance of different coloured objects in different colours of light …

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Improvement on Newton’s original experiment

Improvement on Newton’s original experiment The spectrum formed in Newton’s first experiment was impure. This resulted from the fact that it consisted of a series of circular coloured images all overlapping. Later Newton devised the arrangement shown in Fig. 25.2, which produced a fairly pure spectrum. A converging lens L is placed so as to form an …

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