Multiple Images in a Plane Mirror
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“By placing two plane mirrors facing each other, we may produce an indefinite series of images of an object between them. Each image acts as a material object with respect to the other mirror, in which we see an image of the first image, etc. When the mirrors are placed so as to form with each other an angle that is an aliquot part of 360 degrees, the number of images is one less than the quotient obtained by dividing four right angles by the included angle, provuded that quotient is an even number.” -Avery 1895
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Mirrors and ReflectionsSource
Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 333
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