Two questions dish?

"A reflecting telescope with a parabolic mirror that is 20 meters wide at the top and 4 meters depth in the middle. Where should the eye is? "" Suppose a beam of light emanating from the focus of the parabola y ² = 4x strikes in the parable (1, -2). What is the equation of the reflected beam? "These are not homework problems, but I'm doing for the study. Any help is appreciated. Thanks!

The second question: ============= y = - 2 View this image as a reference. http://en.wikipedia.org/wiki/Parabola First question Derivation_of_the_focus =========== # Make the source of the lowest point of the parable. Is the equation y = ax ^ 2 x = 10 y = April 4 = a * 10 ^ 2 = 0.04 one wants to put the eyepiece in focus. (These two questions involve both the focus). F = 1/4A = 1 / (4 * 0.04) f f = 1/0.16 = 6.25 meters from origin.

US Auctions Australian Auctions Austrian Auctions Belgian Auctions Canadian Auctions French Auctions German Auctions Hong Kong Auctions Indian Auctions Irish Auctions Italian Auctions Dutch Auctions Polish Auctions Singapore Auctions Spanish Auctions Swiss Auctions UK Auctions

Best Match Time: ending soonest Time: newly listed Price: lowest first Price: highest first Price + Shipping: lowest first Price + Shipping: highest first

Edmund Scientific Astroscan Telescope

US $180.00

14h 35m

New Orion SkyQuest XT8 Classic Dobsonian Telescope

US $349.99

24d 1h 10m

Vintage Edmunds Scientific Astroscan Telescope with Base and 28mm Lens

1 Bid

US $99.99

1d 3h 18m

14 F46 BORA SILICA BOROSILICATE TELESCOPE NEWTONIAN MIRROR

0 Bid

US $449.99

3d 4h 6m

SkyWatcher Skyliner 150P Dobsonian Telescope Code10716

11 Bids

US $129.17

4d 15h 45m

New Orion SkyScanner 100mm TableTop Reflector Telescope

US $99.99

5d 46m

Saxon 1309 EQMS 52 Motorised Parabolic Reflector Astronomical Telescope

US $283.52

27d 10h 34m

1000 Vintage Do It Yourself Plans Projects

US $12.99

15d 3h 56m

New Orion SkyQuest XT6i IntelliScope Dobsonian Telescope

US $399.99

5d 23h 38m

Astro Tech 6 f 4 imaging Newtonian Optical Tube

US $299.00

4d 20h 55m

CELESTRON C70 2 3 4 Aperture Multi Coated ZOOM SPOTTING SCOPE w TRIPOD

US $109.00

7d 21h 49m

New Orion StarBlast 45 Astro Reflector Telescope

US $199.99

5d 46m

Meade Dobson LightBridge 16 Deluxe

US $2,635.16

20d 18h 9m

New Orion SkyQuest XT12i Computerized Telescope

US $1,079.99

29d 23h 9m

New Orion SkyQuest XT8g GoTo Dobsonian Telescope

US $949.99

28d 23h 52m

New Orion SkyQuest XT6 Classic Dobsonian Telescope

US $299.99

24d 23h 3m

Meade Teleskop 305cm 12 f 5 LightBridge Dobson

US $1,437.60

27d 19h 37m

Sky Watcher BK DOBSONIANS 12 Collapsible TELESCOPE

US $1,099.00

26d 23h 12m

Sky Watcher BK DOB 10 Collapsible TELESCOPE

US $749.00

26d 22h 48m

Sky Watcher DOB 6 TRADITIONAL TELESCOPE

US $319.00

26d 22h 40m

Meade Teleskop 8 f 6 LightBridge Dobson

US $784.75

25d 17h 23m

Vixen Optics R200S Telescope and GP2 Mount with Starbook 99623D

US $2,899.00

24d 21h 48m

Night Sky Observers Guide Vol1 Autumn and Winter Book 0943396581

US $34.95

18d 19h 35m

Night Sky Observers Guide Vol 2 Spring and Summer 0943396603

US $34.95

18d 19h 35m

Buildings and Structures in County Offaly NEW

US $21.42

17d 9h 20m

Rokinon 6x24 Reflector Telescope in Black 1309EQ2

US $160.99

17d 9h 19m

Sky Watcher 12 Inch Dobsonian Telescope S11740

US $995.00

16d 7h 59m

Meade Teleskop 10 f 5 LightBridge Dobson Deep Sky

US $995.77

15d 8h 51m

Meade 12 f 5 LightBridge DeLuxe HR Teleskop

US $1,437.60

9d 20h 13m

Kit DI COSTRUZIONE SPECCHIO PARABOLICO Ø303 TELESCOPIO

US $497.23

9d 10h 53m

Sky Watcher DOB 8 TRADITIONAL

US $399.00

8d 20h 26m

Meade 12 f 5 Groß LightBridge DeLuxe HR Teleskop

US $1,437.60

8d 12h 4m

Solar Parabolic Concentrator 1177 sq meter solar collector Steam Engine

US $3,400.00

7d 23h 10m

Meade 10 f 5 LightBridge Dobson mit 101 Fok Astro

US $995.77

7d 20h 34m

Meade Teleskop 16 f 45 LightBridge Dobson

US $2,954.34

6d 17h 23m

Meade Teleskop 8 f 6 LightBridge Dobson Großteleskop

US $784.75

6d 14h 43m

Hubble Hyperbolic Newtonian Astrograph Optics HNA14

US $1,300.00

6d 5h 17m

New Orion SkyQuest XT8i IntelliScope Dobsonian Telescope

US $549.99

5d 23h 38m

New Orion SkyQuest XT10g Computerized GoTo Dobsonian Telescope

US $1,149.99

5d 46m

New Orion AstroView 6 Equatorial Reflector Telescope

US $429.99

5d 46m

16 F 45 Lightweight Sandwich Parabolic Telescope Mirror

US $800.00

4d 2h 38m

Meade Teleskop 10 f 5 LightBridge Dobson mit 101 Fok

US $995.77

4d 2h 25m

Meade groß Teleskop 305cm 12 f 5 LightBridge Dobson

US $1,437.60

4d 1h 54m

Meade Teleskop 305cm 12 f 5 LightBridge Dobson Astro

US $1,437.60

3d 21h 38m

Meade groß Teleskop 16 f 45 LightBridge Dobson Astro

US $2,954.34

3d 5h 10m

Meade Teleskop 8 f 6 LightBridge Dobson HR mit 101

US $784.75

2d 12h 16m

226 page Basic Mirror OPTIC LENS OPTICAL Manual on CD

US $9.99

1d 19h 13m

Rokinon Diamond Black 1000x114 Reflector Telescope NEW

US $179.95

25d 14h 19m

Orion SpaceProbe 130ST Equatorial Reflector Telescope

US $399.00

2d 17h 31m

Orion SkyQuest XT6i IntelliScope Dobsonian Telescope

1 Bid

US $199.99

6d 3h 18m

Orion SkyScanner 100mm TableTop Reflector Telescope $99.99 Although perfect for beginning stargazers, this telescope is not a toy! The Orion SkyScanner 100mm TableTop Reflector is just the right size - large enough to see night sky objects yet compact enough to sit on a desk. The wide field of vision is ideal for observing detailed moon craters and even the spectacular rings of Saturn without having to leave town. Under darker skies, the SkySkanner has en...

Orion SpaceProbe 130 EQ Reflector $269.95 Ships to the U.S. including Alaska, Hawaii, and Puerto Rico. Orion SpaceProbe 130 EQ Reflector Telescope An affordable but very capable telescope130mm aperture and 900mm focal length for great all-around viewing performanceIncludes sturdy tripod and equatorial mount for hands-free celestial trackingIncludes two eyepieces, finder scope, focuser, collimation cap, and FREE Starry Night astronomy so...

Rokinon 900 x 130mm Reflector Telescope with Tripod (Black) $160.99 1309EQ2 Features: -Reflector telescope.-Parabolic mirror reflector telescope.-Four-arm, secondary-mirror bracket with fine supports to reduce diffraction spikes and light loss.-Precision lens Newtonian optical system for improved image resolution, detail and clarity.-Light gathering power of the 130mm primary mirror.-Allows for deep sky observation with exceptional field correction free of spheri...

Orion 254mm f/4.7 Reflector Telescope Optical Tube Assembly $499.99 Responding to your requests, we are pleased to offer this reflector optical tube assembly (OTA) for folks who already have an equatorial mount. This optical tube assembly includes Pyrex parabolic mirror optics, upgraded 2" Crayford-style focuser, eyepiece holder, quick-collimation cap, dust cap, and dovetail base for finder scope. Aperture: 254mm (10.0"). Focal length: 1200mm (f/4.7). Has a 2" col...

Orion Atlas 10 EQ-G Reflector Telescope with GoTo Controller $1,899.99 Nights under the stars will never be quite the same with the Atlas 10 EQ-G. They'll be much, much more rewarding. This scope's big 10" optics and newly engineered mount - with GoTo functionality, there is no place you can't go. The handcontroller's database puts over 42,900 objects are at your fingertips. Big-telescope performance is all about the optics. The Atlas 10 features a 254mm (10") parabo...