I n its simplest form, a periscope consists of two mirrors angled at 45°, one above the other so that an image is reflected from the top of the instrument down to the observer at its base. A submarine periscope (shown in the photo below and the diagram to the right) works on the same principle, but has prisms instead of mirrors and a system of lenses to produce a magnified image or a wide field of view. Optical adjustments can be made with the handles.
Related categories OPTICS AND OPTICAL PHENOMENA
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