explain Periscope and Kaleidoscope in very short
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A periscope uses a system of mirrors to view events above your head or behind your back. A kaleidoscope is a toy which uses a system of mirrors to display coloured chips in a variety of patterns (usually a hexagon).
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Optical instruments like the periscope and kaleidoscope use the property of multiple reflections between plane mirrors in order to create the final image or images. In a periscope, two mirrors are placed at an angle of 45∘ with respect to the frame of the periscope such that the mirrors are parallel to each other.
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