3&4 Telescopes3. A telescope has an objective lens with a focal length of 84 cm and an eyepiece with a focallength of 2.6 cm. What is the magnification of this telescope? What is the length of thetelescope when adjusted for a relaxed eye?4. An astronomical telescope has two lenses spaced 84.0 cm apart. If the objective lens has a focallength of 79.5 cm then what is the magnification of the telescope?

3. Step 1: Given, fo=84cm, fe=2.6 cm Step 2: Substitute fo and fe in the formula M=fefo and…

Answered: Telescopes 3. A telescope has an…

Horizons: Exploring the Universe (MindTap Course List)

14th Edition

ISBN:9781305960961

Author:Michael A. Seeds, Dana Backman

Publisher:Michael A. Seeds, Dana Backman

Chapter5: Light And Telescopes

Section: Chapter Questions

Problem 8P: If you build a telescope with a focal length of 1.3 m, what focal length does the eyepiece need to...

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The Yerkes refracting telescope has a 1-m diameter objective lens of focal length 21 m and an eyepiece of focal length 2.0 cm. What is the magnification of the planet Mars as seen through this telescope? Blank 1. Calculate the answer by read surrounding text.
What kind of lens is the lens of the eye? Where does the normal eye form the image? What kind of lens is used to correct farsightedness? Nearsightedness? We can refresh our eyes after reading for a long time by looking at a distant object. Explain
What is the purpose of adaptive optics? A. to improve the angular resolution of telescopes in space B. to eliminate the distorting effects of atmospheric turbulence for telescopes on the ground C. to increase the collecting area of telescopes on the ground D. to increase the magnification of telescopes on the ground E. to allow several small telescopes to work together like a single larger telescope
What phenomenon occurs with the converging lens? Explain. What is the difference between a converging lens and a diverging lens? Explain. What vision problem can be solved by converging lenses? Explain. Mention some applications of converging lenses.
What is the magnification of an astronomical telescope whose objective lens has a focal length of 78 cm and whose eyepiece has a focal length of 2.8 cm? The telescope is set so the image of the eyepiece is at infinity (so the viewer’s eye is “relaxed”). What is the overall length of the telescope? Sketch the situation, defining all your variables Please sketch it, this is most important.
A giant refracting telescope at an observatory has an objective lens of focal length 15m. If an eyepiece of focal length 1.0cm is used, what is the angular magnification of the telescope?
If you build a telescope with a focal length of 1.3 m, what focal length does the eyepiece need to give a magnification of 100 times?
People are often bothered when they discover that reflecting telescopes have a second mirror in the middle to bring the light out to an accessible focus where big instruments can be mounted. “Don’t you lose light?” people ask. Well, yes, you do, but there is no better alternative. You can estimate how much light is lost by such an arrangement. The primary mirror (the one at the bottom in Figure 6.6) of the Gemini North telescope is 8 m in diameter. The secondary mirror at the top is about 1 m in diameter. Use the formula for the area of a circle to estimate what fraction of the light is blocked by the secondary mirror. Figure 6.6 Focus Arrangements for Reflecting Telescopes. Reflecting telescopes have different options for where the light is brought to a focus. With prime focus, light is detected where it comes to a focus after reflecting from the primary mirror. With Newtonian focus, light is reflected by a small secondary mirror off to one side, where it can be detected (see also Figure 6.5). Most large professional telescopes have a Cassegrain focus in which light is reflected by the secondary mirror down through a hole in the primary mirror to an observing station below the telescope.
What are the differences between real and virtual images? How can you tell (by looking) whether an image formed by a single lens or mirror is real or virtual?
Q5: A refracting telescope has the objective lens of focal length (10 m). Assume it is used with an eyepiece of focal length (2 cm). What is the magnification of this telescope?
A typical hobby telescope has an objective lens with a 700 mm focal length and an eyepiece with a 25 mm focal length. The moon has an angularsize of about 0.5° when viewed without optical aid. What angle does the moon subtend in the telescope?
3. A satellite telescope has a parabolic dish. Satellite signals are collected at the focal point (focus) of the parabola. The distance from the vertex of the parabolic dish to the focus is 40 feet. The vertex of the dish is located at a point 50 feet above the ground and 100 feet to the east of a computer that reads and records data from the telescope. The diameter of the dish is 160 feet. What is the depth of the parabolic dish?

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