Telescopes - Principle of Operation and Factors that Affect Its Properties
Telescopes are devices that are used to view the distant objects. They find its use in astronomy and physics. It enables you to view the distant objects by magnifying them. There are many types of telescopes and their prices vary according to the specifications. Many accessories are also available that can be used in conjunction with the telescopes. Small telescopes that are used as toys are also capable of viewing some objects around 50 meters away. Principle in which the telescope works The principle in which the telescope works is very simple. There are two lenses that make up the task of viewing the objects that are at a distance. One of the lenses picks up the light from the object viewed and makes it available at a focus point. Another lens picks up the bright light from the focus point and spreads it out to your retina so that you can view. The lens that picks up the light from the object is called the objective lens or primary mirror. The lens that picks up the light from the focal point is called the eyepiece lens. Factors that affect the viewing of the object The capability of the telescope to collect the light from the object that is viewed and the capability to enlarge the image are the factors that affect the efficiency of the telescope. The capability to collect light from the object depends on the diameter of the lens or mirror, which is otherwise called the aperture. The larger the aperture the more the light it can collect. Enlarging of an image depends on the combination of the lenses that are used. The eyepiece in the telescope performs the magnification. Some of the world's largest optical telescopes in operation We say a telescope to be larger based on the aperture size. Based on this we can say that Keck and Keck II are the largest telescopes in operation with an aperture of 10 meters diameter. The Keck telescope is composed of 36 mirror segments. This is located at Mauna Kea, Hawaii. The next largest is Hobby-Eberly located at Mt. Fowlkes, Texas which has an aperture of 9.2 meters. You can get a list of the largest optical telescopes at http://astro.nineplanets.org/bigeyes.html. Choosing your telescope The choice of the telescope largely depends on what you want to observe. You can choose compound telescopes and refractor type of telescope for viewing through the urban skies. For the rural skies, you can use compound telescopes and reflectors. They are better than the refractors type of telescopes. Each type has its own advantages and disadvantages. Hence, many people have different telescope for different purposes. For more information visit http://www.TelescopeInfoCenter.com
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What's so funny? Laughter Yoga -- reallyTexas Cable News, TX - 4 hours agoAnd while people have laughed for ages, it was not until 1995 that something called Laughter Yoga started spreading around the world. ... |
Beginning yoga class to be held at libraryLog Cabin Democrat, AR - 4 hours agoThe instructor will be Anne Avant, ERYT (Experienced Registered Yoga Teacher), who began attending Iyengar hatha yoga classes while living in the San ... |
ECU offers free sample yoga classAda Evening News, OK - 23 hours agoINSURANCE AGENTS - FINAL EXPENSE. Join the Nation’s Leader! Great Direct Mail Leads. Average weekly income $1500 - $2,5...>MORE THE CHICKASAW NATION is ... |
New power yoga class can help healAgoura Hills Acorn, CA - 13 hours agoThe Oak Park Community Center is offering a power yoga class in addition to the more traditional yoga class already available. Renee Peace, the community ... |
Yoga classes at Plymouth Arts CenterSheboygan Press, WI - 9 hours agoCertified yoga instructor Karen Puchalski will be offering yoga workshops at the Plymouth Arts Center for five Wednesdays and Saturdays beginning Jan. ... |
Yoga in schools criticizedTimes of India, India - 16 hours agoMANGALORE: The state government's plan to make yoga a compulsory part of physical education for the students in the state, has drawn flak from experts here. ... |
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Better Sex Through YogaLimeLife, CA - 3 hours agoIn the back of our minds we always saw the correlation between sex and yoga (duh), yet somehow the two never made the jump to coupledom - until now! ... |
Yoga - Google News
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