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… … while the distance through which the individual particles appearing as a small luminous circle. By vibrating the fork 8, be a wave of light. oscillate is called the amplitude of the oscillation. You will the circle lengthened out into a line, by reflecting which notice that in this description the…
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