Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 460
ear and the simple image of the slit will be seen. If, however,we place in front of L a piece of coloured glass, say red, we shall no longersee rainbow-like bands on the screen, but in their place we shall find anumber of strips of red light and dark spaces alternately, and, as before,these are… … Fig. 213. points and light at others. These alternate dark and light bands are formedon the screen at all distances, and the spaces between them are greater asthe two images, A and B, are nearer together. Further, with the same dis-position of the apparatus, it is found that when yellow light is…
Inventions
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