investigator, enabling him to predict the existence • INTERFERENCE. of phenomena which have never yet been seen, and if those WHAT IS DARKNESS? The most familiar illustration of the interference of sound predictions be found on trial to be rigidly correct, the per- The principle of interference… … appearing as a small luminous circle. By vibrating the fork 8, be a wave of light. Suppose that two series of these light oscillate is called the amplitude of the oscillation. You will the circle lengthened out into a line, by reflecting which waves start from a common origin, B. Then their parts…
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