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per·i·scope  (pĕrĭ-skōp′)
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Tweet n. Any of various tubular optical instruments that conn reflecting elements, such as mirrors and prisms, to permit observation from a position displaced from a direct line of sight. per′i·scopic(-skŏpĭk), per′i·scopi·cal(-ĭ-kəl)adj.  (click for a larger image) periscopeLight enters the top lens of a periscope, reflects off a mirror set at a 45 degree angle, travels down the periscope tube, and reflects off a second mirror, also set at a 45 degree angle. Light that reflects off the second mirror exits through the bottom lens and into the eye of the user. |
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