Telescope Eyepiece Lens
November 25th, 2008
A telescope that produces an overall angular magnification of 38 uses an eyepiece lens with a focal length of?
A telescope that produces an overall angular magnification of 38 uses an eyepiece lens with a focal length of 5 cm. What is the focal length of the objective lens?
_____cm
Magnification = F(objective)/F(eyepiece), thus F(objective = Magnification*F(eyepiece) = 190 cm.
|
|
Naval telescope Photo Mugs This achromatic telescope has a tapering mahogany barrel with brass fittings, including a single draw tube, an objective lens cap and a pivoted eyepiece cover. It is typical of the sort of telescope used on board ship in the 19th century….. |
|
|
Night telescope Photo Mugs This night telescope has a wooden barrel with a leather covering and silvered brass fittings. It has an objective lens cap and a pivoted eyepiece cover. It has a large objective lens (67 mm in diameter) to collect as much light as possible when viewing at night. The telescope gives an inverted image – additional lenses to correct the image would cut down the amount of light reaching the eyepiece….. |
|
|
Night telescope Photo Mugs This telescope has a leather-covered barrel and a single brass draw tube. The brass fittings include an objective lens cap and a sliding eyepiece cover. It has a large non-achromatic objective lens to allow as much light as possible to enter the telescope. The telescope doesnt have extra lenses to correct the inversion of the image created by the objective lens, since the more lenses a telescope h… |
|
|
Fisher-Price Kid-Tough Binoculars $14.99 Tough enough for little explorers, with 2.4x magnification and rubberized lens guard bumpers. Soft eye-pieces, adjustable eye-piece spacing, breakaway neck strap and textured hand grips and focus knob make these binoculars safe, easy and fun for kids to use. Explore the world with your very own set of kid tough binocularsManual interocular adjusting makes it easier for kids to seeRubberize… |
|
|
Celestron 44102 400x Power Laboratory Biological Microscope $84.99 The Celestron(r) 400x Laboratory Biological Microscope comes with many scientific essentials such as a diaphragm and a condenser. Its efficient charm comes in its power and precision, with 3 different objective lenses and a monocular, adjustable head that rotates from 0 to 60 degrees for comfortable viewing…. |
|
|
Orion Observer 70mm Equatorial Refractor Telescope $129.99 Orion’s Observer 70 EQ combines the solid optical performance of a classic achromatic refractor with a German style equatorial mount. The Observer 70 features very good optics and 36 percent more light gathering power than 60mm beginner scopes. The complete accessory package includes high and low power eyepieces, a 90 degree star diagonal, a red-dot finder, illustrated instructions, and Orio… |
|
|
Trijicon Lens Dust Cover Fits all models with sunshades $20.99 Lens Dust Cover Fits all models with sunshades…. |
|
|
Bushnell Powerview 8×21 Compact Folding Roof Prism Binocular (Black) $12.96 Bushnell PowerView binoculars offer the best of both worlds, combining contemporary styling and design with traditional Bushnell quality and durability. This particular PowerView binocular offers an 8x magnification and a 21mm objective diameter. The fully coated optics, meanwhile, guarantee superior light transmission and brightness, helping you see just about any target, whether you’re searching… |
|
|
Tasco Essentials 8×21 Binocular (Black) $8.20 The Tasco 165RB is a 8 x 21mm Essentials Roof Prism Binocular. It is perfect for giving to children, throwing in the glove box of a car or taking with you when you don’t want to worry about your investment. This ultra-light binocular offers outstanding compact performance with rugged, rubber armor for hiking, backpacking or bicycle touring…. |
|
|
Bushnell PowerView 20×50 Super High-Powered Surveillance Binoculars $57.58 Bushnell PowerView binoculars offer the best of both worlds, combining contemporary styling and design with traditional Bushnell quality and durability. This particular PowerView binocular offers a 20x magnification–among the most powerful in its class–and a 50mm objective diameter. The multicoated optics, meanwhile, guarantee superior light transmission and brightness, helping you see just abou… |
