Binoculars
Binoculars
Its an optical instrument with a lens for each eye, used for viewing distant objects.
History
- Binoculars were first invented in 17th century. Early binoculars were made with glass lenses and generally employed Galilean optics.
- Galileo Galilee's intention was to improve the distance of how far you can see from the telescope. His design with 2 spy glasses worked much better, thus inventing the binoculars.
- Galilean binoculars had a curved optical element (lens or mirror) that captured light from the object being viewed, focusing the light rays to produce a real image.
- Additionally, there was an inverted eyepiece. Together, these elements had the ability to produce an erect, or right-side-up, image. Unfortunately, they also produced a narrow field of vision and low magnification abilities.
How it works
- There are two lenses in a binocular, The first lens catches light rays from the distant object and makes a focused image a short distance behind the lens. This lens is called the objective, because it's nearest to the object you're looking at. The second lens picks up that image and magnifies it.
- When light rays from a distant object pass through a convex lens, they cross over. That's why distant things sometimes look upside down if you look at them through a magnifying glass.
- So binoculars have a pair of prisms inside them to rotate the image through 180 degrees. One prism rotates the image through 90 degrees , then the next prism rotates it through another 90 degrees, so the two prisms effectively turn it upside down.
types of binoculars
There are two types of binocular:
Porro prism binoculars: The Porro prism was invented by Ignazio Porro in mid-19th century. All of its reflective surfaces are completely reflective, so it loses no light. The optical path is bent like the letter Z which makes them larger than roof prisms
Roof prism binoculars: Roof prism binoculars have straight barrels. They are generally lighter and more compact than porro prisms.
Benefits on society
- Binoculars can be used for many different activities like:
- Coin Operated Binoculars can be used for public to view scenic areas
- binoculars can be used for bird watching enthusiasts and hikers to see wild life much more visibly with efficiency
- Hunters can very effectively kill animals with a crystal clear view of their target either close range or further away with either a scope adjusted to their rifle or having a spotter with binoculars in hand
- Binoculars can be used while sports fanatics are far up in the Grand Stand and can't see the game as close
- Security: Private investigators, security professionals, and law enforcement use binoculars during surveillance projects to view subjects and their activity from a distance
coin operated binoculars
"Seecoast Coin Operated Telescopes and Binoculars." Seecoast Coin Operated Telescopes and Binoculars. N.p., n.d. Web. 29 May 2016.
use of binoculars for hunting
"Spotting Alaskan Game, Alaska Department of Fish and Game." Spotting Alaskan Game, Alaska Department of Fish and Game. N.p., n.d. Web. 29 May 2016.
security
"U.S. Soldiers Inspect Storage Units in Afghan Center." U.S. Department of Defense, Photo Essay. N.p., n.d. Web. 29 May 2016.
citations
- "A Short Binocular History." A History of Binocular Development |Helpful Accessories. N.p., n.d. Web. 29 May 2016.
- "Binoculars for Surveillance and Monitoring Subjects from a Distance."Binoculars for Surveillance and Monitoring Subjects from a Distance. N.p., n.d. Web. 29 May 2016.
- "How Do Binoculars Work?" Explain That Stuff. N.p., n.d. Web. 29 May 2016.
- 110gs, Simone. "The History and Importance of Binoculars." Prezi.com. N.p., n.d. Web. 29 May 2016.
- "Structure and Optical Technologies Prisms of Binoculars." Nikon. N.p., n.d. Web. 29 May 2016.
- "Whats the Difference between Porro and Roof Prism Binoculars." Whats the Difference between Porro and Roof Prism Binoculars. N.p., n.d. Web. 29 May 2016.