General Knowledge - Basic General Knowledge - Discussion

57. 

For seeing objects at the surface of water from a submarine under water, the instrument used is

[A]. kaleidoscope
[B]. periscope
[C]. spectroscope
[D]. telescope

Answer: Option B

Explanation:

No answer description available for this question.

Saddam Ali said: (Jul 26, 2011)  
Peroscopic is an instrument that used in submarine for seeing the object on water surface, the basic principle used in it that light mechanism, we use two mirror which parelle each other in a tube at 45' angle with two lens for see outside image.

Nikita Gupta said: (Aug 5, 2011)  
What is use of kaleidoscope and spectroscope?

Rajeshwar Joshi said: (Aug 17, 2011)  
A periscope is an instrument for observation from a concealed position. In its simplest form it consists of a tube with mirrors at each end set parallel to each other at a 45-degree angle. This form of periscope, with the addition of two simple lenses, served for observation purposes in the trenches during World War I. Military personnel also use periscopes in some gun turrets and in armoured vehicles.

More complex periscopes, using prisms instead of mirrors, and providing magnification, operate 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.

Shaheen said: (Sep 2, 2011)  
Kaleidoscope is a circle of mirrors containing loose, colored objects such as beads or pebbles and bits of glass. As the viewer looks into one end, light entering the other end creates a colorful pattern, due to the reflection off the mirrors.

Kaleidoscopes operate on the principle of multiple reflection, where several mirrors are attached together. Typically there are three rectangular lengthwise mirrors. Setting the mirrors at a 45-degree angle creates eight duplicate images of the objects, six at 60 deg, and four at 90 deg. As the tube is rotated, the tumbling of the coloured objects presents the viewer with varying colours and patterns. Any arbitrary pattern of objects shows up as a beautiful symmetrical pattern created by the reflections in the mirrors. A two-mirror model yields a pattern or patterns isolated against a solid black background, while a three-mirror (closed triangle) model yields a pattern that fills the entire field.

Aneesh A said: (Feb 8, 2012)  
Periscope and kaleidoscope.

Noor said: (Feb 24, 2012)  
What is use kaleidoscope, periscope, telescope and spectroscope?

Amar Kumar said: (Jun 7, 2012)  
A kaleidoscope is a cylinder with mirrors containing loose, colored objects such as beads or pebbles and bits of glass. As the viewer looks into one end, light entering the other creates a colorful pattern, due to the reflection off of the mirrors. Coined in 1817 by Scottish inventor Sir David Brewster.

A periscope (or berinscope) is an instrument for observation from a concealed position. In its simplest form it consists of a outer case with mirrors at each end set parallel to each other at a 45-degree angle. This form of periscope, with the addition of two simple lenses, served for observation purposes in the trenches during World War I. Military personnel also use periscopes in some gun turrets and in armoured vehicles.

A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light). The first known practical telescopes were invented in the Netherlands at the beginning of the 1600s (the 17th century) , using glass lenses. They found use in terrestrial applications and astronomy.

A spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum.

Bilal said: (Jun 9, 2012)  
Thank you Mr Amar

Pari Suri said: (Aug 26, 2014)  
what is kaleidoscope? What is the use of kaleidoscope?

Ambika said: (May 18, 2016)  
Spectroscope also detects the objects under the surface of the water.

Ganesh Thigari said: (Feb 26, 2017)  
Periscopes allow a submarine, when submerged at a relatively shallow depth, to search visually for nearby targets and threats on the surface of the water and in the air. When not in use, a submarine's periscope retracts into the hull.

A submarine commander in tactical conditions must exercise discretion when using his periscope, since it creates a visible wake (and may also become detectable by radar[citation needed]), giving away the sub's position.

Prajapati said: (May 23, 2017)  
Kaleidoscope is a circle of mirrors containing loose, colored objects such as beads or pebbles and bits of glass. As the viewer looks into one there are three rectangular lengthwise mirrors. Setting the mirrors at a 45-degree angle creates eight duplicate images of the objects, six at 60 deg, and four at 90 degrees.

As the tube is rotated, the tumbling of the coloured objects presents the viewer with varying colours and patterns. Any arbitrary pattern of objects shows up as a beautiful symmetrical pattern created by the reflections in the mirrors. A two-mirror model yields a pattern or patterns isolated against a solid black background, while a three-mirror (closed triangle) model yields a pattern that fills the entire field.

Amali said: (Sep 8, 2019)  
What is periscope?

Amali said: (Sep 8, 2019)  
What is kaleidoscope and sprectoscope?

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