Refracting Telescope Parts
(HELP PLZ) The objective and eyepiece of a refracting telescope have focal lengths 84 cm and 3.4 cm?
(a) What is the angular size of the Moon as viewed from Earth’s surface?
0.00904 rad ==> correct answer
(b) The objective and eyepiece of a refracting telescope have focal lengths 84 cm and 3.4 cm, respectively. What is the angular size of the Moon as viewed through this telescope?
answer in rad
please help me out with part b..10pts best answer…thank you very much it would be greatly appreciated if anybody answers correctly 
the angular size of the Moon as viewed through the telescope is 0.223 rad
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BARSKA 40070 Starwatcher Compact Refractor Telescope with Table Top Tripod And Carrying Case $59.39 Barska 300x Starwatcher Refractor Telescope for aspiring astronomers… SAVINGS PRICED! Everything you need to get your start in astronomy! The Barska 300x Starwatcher Refractor Telescope is as powerful as it is easy to set up and includes everything necessary to begin the adventure of a lifetime including telescope, finderscope, eyepieces, mount and tripod. You also get the new beginner’s version… |
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Emerson Refractor Telescope with Tripod $17.99 Get a closer look with the Emerson Refractor Telescope and Tripod. It makes a great companion at sporting events, under the night sky, or on a bird watching trek…. |
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Bushnell Voyager 565x60mm Refractor Telescope … |
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Meade 70AZ-A Telescope $149.00 The world’s top astronomers got started with a telescope just like this one, and so will you. A quality refracting telescope for land or sky viewing. Perfect for observing Saturn, Jupiter, the Moon, and land objects. A first look at the rings of Saturn or the craters of the Moon can inspire a lifetime of exploration. Go to any star party anywhere in the world and you’ll see more Meade telescopes t… |
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Meade 70AZ-A 70mm/2.8 inch Altazimuth Achromatic Refractor Telescope Kit When was your first gaze at the stars? Most astronomers trace their love of the night sky to a first look at Saturn through a telescope just like this one – a quality refracting telescope for land or sky viewing. Meade 70mm 70AZ AR Achromatic Refractor Telescope 04043 is an entry-level telescope that will let you see craters on the Moon, the rings of Saturn, the cloud belts of Jupiter and its moon… |
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Celestron 21061 AstroMaster 70 AZ Refractor Telescope $96.23 Celestron AstroMaster 70AZ 45 – 90X Refractor Telescope. Affordable, powerful, lightweight… the perfect choice for amateur astronomers and backyard stargazers! Proving once again that you don’t need NASA’s budget to see the stars. If you’re aiming to get started in astronomy, the AstroMaster 70AZ’s blend of quality optics, entry-level usability and affordable price is tough to beat. It’s lightwe… |
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Meade 20218 NG-70SM 70mm Altazimuth Refractor Telescope $69.95 MEADE 20218 NG-70SM 70mm Altazimuth Refractor Telescope… |
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Choosing and Using a Refracting Telescope $39.95 Choosing and Using a Refracting Telescope has been written for the many amateur astronomers who already own, or are intending to purchase, a refracting telescope — perhaps to complement their existing arsenal of larger reflecting telescopes — or for the specialist who requires a particular refractor for serious astronomical applications or nature studies.Four hundred year ago, during the winter of 1609, a relatively unknown Italian scientist, Galileo Galilei designed a spyglass with two crude lenses and turned it skyward. Since then, refractors have retained their dominance over all types of reflector in studies of the Moon, planets and double stars because of the precision of their optics and lack of a central obstruction in the optical path, which causes diffraction effects in all commercially-made reflectors.Most mature amateur astronomers got started with a 60mm refractor, or something similar. Thirty years ago, there was little choice available to the hobbyist, but in the last decade long focus crown-flint achromats have moved aside for some exquisitely crafted apochromatic designs offered by leading commercial manufacturers. There has been a huge increase in the popularity of these telescopes in the last few years, led by a significant increase in the number of companies (particularly, William Optics, Orion USA, StellarVue, SkyWatcher and AstroTech) who are now heavily marketing refractors in the amateur astronomical magazines.In Choosing and Using a Refracting Telescope, well-known observer and astronomy writer Neil English celebrates the remarkable history and evolution of the refracting telescope and looks in detail at the instruments, their development and their use. A major feature of this book is the way it compares not only different classes of refractor, but also telescopes of each class that are sold by various commercial manufacturers. The author is perhaps uniquely placed to do this, having used and tested literally hundreds of different refracting telescopes over three decades.Because it includes many diverse subjects such as imaging with consumer-level digital cameras, imaging with webcams, and imaging with astronomical CCD cameras — that are not covered together in equal depth in any other single volume — Choosing and Using a Refracting Telescope could become the 'refractor bible' for amateur astronomers at all levels, especially those who are interested in imaging astronomical objects of every class. |
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Telescope $5.99 Telescope |
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TELESCOPE: TELESCOPE $9.03 TELESCOPE: TELESCOPE |
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EdIn OMEGA REFRACTOR TELESCOPE $80.99 Educational Insights OMEGA REFRACTOR TELESCOPE. Explore the universe, even deep-sky phenomena, with this powerful 700mm refractor telescope. Great for explorers of any age. SMALL PARTS [1]. Not for < 3 yrs. Grades 3+ Ages 8+ |
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Dew Drop, Refracting Image of Flower $24.99 Adam Jones Dew Drop, Refracting Image of Flower – Photographic Print |
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Meade NG-60 Telescope $89.95 The worlds top astronomers got started with a telescope just like this oneand so will you. A quality refracting telescope for land or sky viewing. Perfect for observing Saturn, Jupiter, the Moon, and land objects. A first look at the rings of Saturn or the craters of the Moon can inspire a lifetime of exploration. Go to any star party anywhere in the world and youll see more Meade telescopes than any other. Comes with AutoStar Suite Astronomer Edition Software on DVD AutoStar Suite Astronomer Edition software will help you learn the night sky. It displays more than 10,000 celestial objects including planets, stars, galaxies and nebulas. You can print out star charts and even plan your observing sessions. It operates on any Windows based PC. Also includes Instructional Videos. Youll be up and running in no time. The universe is waiting. FEATURES Slow Motion Controls on Both Axes Find and track objects easily with precision controls Includes Red Dot Projection Viewfinder For easy acquisition of guide stars while starhopping for celestial targets Heavy-Duty Steel Tube Tripod Provides a rock solid platform for viewing This item cannot be shipped internationally due to size and weight. |
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Refracting Prism $5.99 Experience the amazing full color spectrum! What a novel(ty) idea! Makes a great, wacky gift! Educational as well as fun, our 4 1/2-inches wide plastic prism comes on an illustrated blistercard with interesting facts about color, light and refraction. Order yours today! Measures about 5/8-inch tall x 4 1/2-inches wide x 1 1/4-inches long. |
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Light Refracting Through Piece of Clear Material $79.99 Dmitri Kessel Light Refracting Through Piece of Clear Material – Photographic Print |
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Close View of Light Refracting off a Compact Disc $39.99 Close View of Light Refracting off a Compact Disc – Photographic Print |
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Frost on a Window with Morning Sun Refracting Through Ice $39.99 Paul Nicklen Frost on a Window with Morning Sun Refracting Through Ice – Photographic Print |
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Emerson 50X/100X Telescope with Tripod $39.99 View objects up to 100 times closer than the naked eye. Product features: Interchangeable 50X and 100X eyepiece lenses; 3X Finder Scope to locate objects faster; lightweight and durable construction, full-sized adjustable tripod, mirrored diagonal eyepiece for easy viewing, protective lens cap, quick screw-type assembly with no tools required. Great for star tracking and astronomical viewing. Locking tripod legs fully expand to stand up to 4-feet high. 360° degree rotating pan head lets you navigate the night sky. *Do not view the sun directly with this telescope as it can cause serious eye damage. WARNING: CHOKING HAZARD – Small Parts. Not for children under 3 years. |
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Amateur Telescope Making in the Internet Age $34.95 Building an astronomical telescope offers the amateur astronomer an exciting challenge, with the possibility of ending up with a far bigger and better telescope than could have been afforded otherwise. In the past, the starting point has always been the grinding and polishing of at least the primary mirror, a difficult and immensely time-consuming process. But now that the Internet has brought us together in a global village, purchasing off-the-shelf goods such as parabolic mirrors, eyepieces, lenses, and telescope tubes, is possible. There are also a vast number of used mirrors and lenses out there, and it is now possible to track them down almost anywhere in the world. Online stores and auction houses have facilitated commerce regarding all sorts of useful optical components at a reasonable price. This is a book about making telescopes from available parts. It provides guidance on where to look and what to look for in selecting items useful for telescope making and explains how to assemble these components to produce an excellent instrument on a tight budget. At one time, many amateurs made their own telescopes from home-made parts. In today's rushed world, that has almost become a lost art. The Internet offers a wonderful alternative to either buying a pricey scope fully assembled or making your own from scratch. |
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The History of the Telescope $22.36 The History of the Telescope |
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The Origins of the Telescope $44.05 The Origins of the Telescope |