👉 A periscope is a type of telescope that allows one to view and interpret images from a distance, typically using mirrors or lenses. These telescopes are often used in astronomy, space science, and other fields where long distances need to be observed. The term "periscopes" refers to the idea of viewing an object from a distance, which can be useful for observing stars, galaxies, and celestial objects that would otherwise be too difficult or impossible to view directly.