scope. If the angle between theglass plates be 60° five images will be seen, and these withthe object will be arranged symmetrically with respect to themirrors. This is made use of in the kaleidoscope; in itssimplest form the instrument consists of two long narrowmirrors enclosed in a tube and… … Fig. 29. through the hole along the axis of the tube at any object onthe glass would see a symmetrical six-fold pattern formed bythe object and its five images in the mirrors. A number ofpieces of coloured glass rest on the ground glass and can beshifted about by moving the tube. As this is done…
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