E B, will be refracted to been separated into a series of colors stretching from V to the point, F. The same would be true for any other paral- R ; but on passing through B, they undergo a reversing pro- lel rays not drawn in the figure, because they would be acted cess, and are brought to a focus… … ^lasi into air, it is bent in the opposite direction. In Fig. 1 die of the lens, because the angle decreases more and more. they correct each other because they act in opposite direc- the upper half of the circle, above X Y, is a rarer and the low- The point, F, is called the focus, a word meaning…
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