the purity. This may be done, though veryimperfectly, if we limit the breadth of the incident beam by aseries of diaphragms, but such a device will not help us veryfar; for one reason, we shall lose too much light. Newton explained the method to be adopted. We canreduce DE to a narrow image of the… … Insert the prism in the position of minimum deviation in thepath of the rays after they have traversed the lens, they willbe refracted, and will converge to form real images V, R, ofthe slit. These real images will be at the same distance fromthe prism as «$, and on shifting the screen to receive…
Heat · Light
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