A periscope, historically used in submarines, allows a viewer to see over or around obstacles primarily using which optical principle?

Explanation

A periscope allows a viewer to see over or around obstacles by using two angled mirrors, or sometimes prisms, positioned parallel to each other within a tube, so that light entering the top is reflected downward and then reflected again toward the viewer’s eye at the bottom. This simple but effective optical arrangement was historically essential for submarine crews, allowing them to observe the surface while the vessel remained submerged. Periscopes have also been used in other applications, including some military vehicles and certain types of security or observation equipment. Explore more Everyday Science MCQs on mcqstutor to keep practicing.