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A simple periscope can be made of basically two mirrors and a pipe.

The 1st mirror is set at 45 degrees and inverts the image. The 2nd is set below and inverts the image again so you get a proper image.

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It's used for seeing around where you can't usually see (like a submarine seeing above water).

More complex periscopes are made of many lenses and prisms, or advanced fiber optics, which can give you many more options. There is also an eyepiece, a wheel for rotating the tube, gearing, and depending on the type of periscope, an objective, which would be where you see out... which could be set with a lens, a camera, just be a simple part of the tube, or something much more complex depending on how the periscope is made.

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10y ago

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