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What is a Periscope Periscope is an optical instrument which uses a system of prisms, lenses, or mirrors to reflect images through a tube. In this instrument, plane mirrors are used to fold light so that the image of an object can be brought down to a lower level. The essential parts of a periscope are a tube, prisms, lenses, mirrors, and an eyepiece. The image is received in one mirror is reflected through the tube to a mirror visible to the viewer. Checkout for more information: https://physics.tutorvista.com/light/plane-mirror.html Follow us at: https://www.facebook.com/tutorvista https://twitter.com/TutorVista