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Light enters the top lens of a periscope, reflects off a mirror set at a 45 degree angle, travels down the periscope tube, and reflects off a second mirror, also set at a 45 degree angle. Light that reflects off the second mirror exits through the bottom lens and into the eye of the user.
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.
per′i·scop′ic (-skŏp′ĭk), per′i·scop′i·cal (-ĭ-kəl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
any of a number of optical instruments that enable the user to view objects that are not in the direct line of vision, such as one in a submarine for looking above the surface of the water. They have a system of mirrors or prisms to reflect the light and often contain focusing lenses
[C19: from Greek periskopein to look around; see peri-, -scope]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
art at periosteum(ˈpɛr əˌskoʊp)
an optical instrument for viewing objects in an obstructed field of vision, consisting of a tube with an arrangement of prisms or mirrors and, usu., lenses: used esp. in submarines.
[1815–25; back formation from periscopic]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Light enters the top lens of the periscope, reflects off a mirror set at a 45° angle, travels down the periscope tube, and reflects off a second mirror, also set at a 45° angle. The light that reflects off the second mirror exits through the bottom lens and into the eye of the user.
An instrument that has angled mirrors or prisms and allows objects not in the direct line of sight to be seen.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||periscope - an optical instrument that provides a view of an otherwise obstructed field|
optical instrument - an instrument designed to aid vision
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
بيرسكوب: مِنْظار الغَوّاصات والخَنادِق
periscope[ˈperɪskəʊp] N → periscopio m
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
periscope[ˈpɛrɪskəʊp] n → périscope m
Collins English/French Electronic Resource. © HarperCollins Publishers 2005
n → Periskop nt
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
periscope[ˈpɛrɪˌskəʊp] n → periscopio
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
a tube containing mirrors, through which a person can look in order to see things which cannot be seen from the position the person is in, especially one used in submarines when under water to allow a person to see what is happening on the surface of the sea. periskoop بيرسكوب: مِنْظار الغَوّاصات والخَنادِق перископ periscópio periskop das Periskop periskop περισκόπιοperiscopio periskoop پریسکوپ periskooppi périscopeפריסקופ परिदर्शक periskop periszkóp periskop sjónpípa, hringsjá periscopio 潜望鏡 잠망경 periskopas periskops periskop periscoopperiskop peryskop يوډول اله ده چې داوبتل او داوبو له تل نه دهغې په ذريعه دسيند ( بحر ) مخ او دهغه شاوخوا ځايونه ويني periscópio periscop перископ periskop periskop periskop periskop กล้องส่องดูเหนือผิวน้ำของเรือดำน้ำ periskop 潛望鏡 перископ بالابين، پيري اسکوپ kính tiềm vọng/ kính viễn vọng 潜望镜
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.