ose eyes are under examination to make a seriesof matches with variously coloured skeins of wool. Thecolour-blind eye will make mistakes between grey, greens andsome shades of reddish yellow. 128. The Colour box. More accurate tests can bemade by means of the colour top with variously coloureddiscs… … slit S • the red rays from S are all brought to a focus at R,suppose now that a slit were placed at R and illuminatedwith white light, a spectrum would be formed by the prismand the red of that spectrum would be focussed at IS. Placea second slit at V; the light from this slit will be dispersedto…
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