A periscope is an optical instrument that enables one to see round corners or over obstacles. It consists of a tube with mirrors at every finish, considered one of which is semi-transparent. Mild enters the periscope by way of the target lens and is mirrored by the primary mirror to the second mirror, which then displays it to the eyepiece. The observer appears by way of the eyepiece and sees a picture of the scene in entrance of the target lens, as in the event that they have been trying straight at it. Periscopes are utilized in quite a lot of purposes, together with navy, marine, and industrial settings.
Periscopes have been used for hundreds of years, with the primary recognized instance relationship again to the sixteenth century. They’ve performed an necessary function in navy historical past, permitting troopers to look at enemy positions with out exposing themselves to fireplace. Periscopes are additionally utilized in marine purposes, resembling submarines and diving bells, to permit the occupants to see above the water’s floor. In industrial settings, periscopes are used to examine equipment and different objects which are tough to see straight.
