2007-02-05 18:54:58 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
A periscope is an instrument for observation from a concealed position. In its simplest form it is a tube in each end of which are mirrors set parallel to each other and at an angle of 45° with respect to the line between them.
A periscope may be used as a toy or for seeing over people's heads in a crowd. This form of periscope, with the addition of two simple lenses, was used for observation purposes in the trenches during World War I. Periscopes are also used in some gun turrets and armoured vehicles.
More complex periscopes, using prisms instead of mirrors, and providing magnification, are used on submarines. The overall design of the classical submarine periscope is very simple: two telescopes pointed into each other. If the two telescopes have different individual magnification, the difference between them causes an overall magnification or reduction.
2007-02-05 19:08:28 · answer #1 · answered by Innovator says.. 1 · 0⤊ 0⤋
It's an instrument for observation from a concealed position.
I don't think that astronomer use periscope!!
2007-02-06 03:48:07 · answer #2 · answered by hyaki ikari 2 · 0⤊ 0⤋
Any of various tubular optical instruments that contain reflecting elements, such as mirrors and prisms, to permit observation from a position displaced from a direct line of sight.
2007-02-06 02:59:42 · answer #3 · answered by VibeLord . 3 · 0⤊ 0⤋
IT IS A DEVICE USED TO SEE OUTSIDE WITHOUT YOURSELF BEING SEEN
2007-02-06 02:57:34 · answer #4 · answered by Anonymous · 0⤊ 0⤋