21ST CENT.AST.W/WKBK+SMARTWORK >BI<
6th Edition
ISBN: 9780393415216
Author: Kay
Publisher: NORTON
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Chapter 6, Problem 10QP
To determine
The reason for getting high quality images from cameras using adaptive optics.
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The Very Long Baseline Array (VLBA) is
a.
the highest resolution optical telescope ever built.
b.
located in Arecibo, Puerto Rico.
c.
a matched pair of 8-meter telescopes, one of which is in Chile and the other in Hawaii.
d.
an airborne infrared telescope.
e.
a set of radio telescopes linked together electronically to provide very high resolution.
Which of the following describes interferometry?
a.
It is used to improve resolving power.
b.
It decreases the chromatic aberration of a telescope.
c.
It works only for large X-ray and ultraviolet telescopes.
d.
It requires that radio telescopes be within a few hundred feet of each other.
e.
None of the above statements are true.
The Hubble Space Telescope, orbiting above Earth’s atmosphere, eliminates the blurring effect of Earth’s atmosphere and permits the telescope to
a.
observe gamma rays.
b.
observe wavelengths from the near infrared to the near ultraviolet.
c.
receive radio wavelengths.
d.
transmit radar pulses that reflect off the surface of the moon.
Chapter 6 Solutions
21ST CENT.AST.W/WKBK+SMARTWORK >BI<
Ch. 6.1 - Prob. 6.1ACYUCh. 6.1 - Prob. 6.1BCYUCh. 6.2 - Prob. 6.2CYUCh. 6.3 - Prob. 6.3CYUCh. 6.4 - Prob. 6.4CYUCh. 6.5 - Prob. 6.5CYUCh. 6 - Prob. 1QPCh. 6 - Prob. 2QPCh. 6 - Prob. 3QPCh. 6 - Prob. 4QP
Ch. 6 - Prob. 5QPCh. 6 - Prob. 6QPCh. 6 - Prob. 7QPCh. 6 - Prob. 8QPCh. 6 - Prob. 9QPCh. 6 - Prob. 10QPCh. 6 - Prob. 11QPCh. 6 - Prob. 12QPCh. 6 - Prob. 13QPCh. 6 - Prob. 14QPCh. 6 - Prob. 15QPCh. 6 - Prob. 16QPCh. 6 - Prob. 17QPCh. 6 - Prob. 18QPCh. 6 - Prob. 19QPCh. 6 - Prob. 20QPCh. 6 - Prob. 21QPCh. 6 - Prob. 22QPCh. 6 - Prob. 23QPCh. 6 - Prob. 24QPCh. 6 - Prob. 25QPCh. 6 - Prob. 26QPCh. 6 - Prob. 27QPCh. 6 - Prob. 28QPCh. 6 - Prob. 29QPCh. 6 - Prob. 30QPCh. 6 - Prob. 31QPCh. 6 - Prob. 32QPCh. 6 - Prob. 33QPCh. 6 - Prob. 34QPCh. 6 - Prob. 35QPCh. 6 - Prob. 36QPCh. 6 - Prob. 37QPCh. 6 - Prob. 38QPCh. 6 - Prob. 39QPCh. 6 - Prob. 40QPCh. 6 - Prob. 41QPCh. 6 - Prob. 42QPCh. 6 - Prob. 43QPCh. 6 - Prob. 44QPCh. 6 - Prob. 45QP
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- Why is it advantageous to use a large-diameter objective lens in a telescope? (a) It diffracts the light more effectively than smaller-diameter objective lenses. (b) It increases its magnification. (c) It enables you to see more objects in the field of view. (d) It reflects unwanted wavelengths. (e) It increases its resolution.arrow_forwardPeople 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.arrow_forwardA telescope that suffers from chromatic aberration and has a low light-gathering power is most likely a(n) a. small diameter reflecting telescope. b. small diameter refracting telescope. c. large diameter refracting telescope. d. large diameter reflecting telescope e. infrared telescope.arrow_forward
- Which of the following is NOT an advantage that a REFLECTING telescope has over a REFRACTING telescope? a. glass need not be as of high quality. b. can see stars during the day. c. less expensive. d. no chromatic aberration. e. mirror can be supported more fully than lens. 2. When looking at a cross section diagram of a planet, why might the layer of a planet between the core and crust appear green? a. There is a lot of methane in that layer.b. To represent chlorophyll in the atmosphere. c. This layer is typically made of green jade.d. Green is the middle color of ROYGBIV, so it was used to represent the middle layer. e. Because such layer is composed of rocks containing a lot of Olivine.arrow_forwardIf the diameter of a radar dish is doubled, what happens to its resolving power, assuming that all other factors remain unchanged? a. The resolving power quadruples. b.The resolving power doubles. c. The resolving power is reduced to 1/2 of its original value. d. The resolving power is reduted to 1/4 of its original value. e.The resolving power does/not change unless the focal length changes. f.None of the abovearrow_forwardA telescope is used to resolve two distant stars. By what factor will the resolution of the telescope change if the diameter of the lens is doubled? a)The resolution will increase by a factor of 4 b)The resolution will increase by a factor of 2 c)The resolution will not change, although more light will be collected. d)The resolution will decrease by a factor of 2 e)The resolution will decrease by a factor of 4 f)arrow_forward
- A new generation of telescopes is currently being built that overcomes the limitations of the older large telescopes. Some of these new telescopes a. use segmented mirrors. b. use mirrors that are very thin. c. use active optics to control the shape of the mirror. d. do all of the above. e. do none of the above.arrow_forwardThe instrument that can record the image of a faint object in the least amount of observing time is the a. human eye. b. photographic plate. c. photometer. d. charge-coupled device (CCD). e. spectrometer.arrow_forwardAstronomers who use ground-based telescopes spend a lot of time and effort dealing with something called seeing. Sometimes they build adaptive-optics systems to try and partially overcome it. What is seeing? Group of answer choices Stray light from buildings, cars, parking lots, streetlights, etc.., which makes the night sky brighter and thus makes it harder to see faint astronomical objects The inability of refracting telescopes to bring all colors of light to a focus at the same distance from the objective lens. Turbulence in the Earth's atmosphere that makes for blurry images of astronomical objects The ability of a spectrograph or spectrometer to spread light out into its constituent colors, thus revealing what a distant object is made of.arrow_forward
- Which of the following is not a problem for refracting telescopes? OA. Different wavelengths of light are focused at slightly different locations. OB. The quality of the glass lens in transparency and in the shape of both surfaces must be high. OC. The secondary mirror blocks some of the light passing through the primary lens. OD. The primary lens can only be supported at the edges making deformation of large lenses difficult to avoid.arrow_forward2. An aperture stop in an optical imaging system cannot be used to determine A. Image resolution. B. Depth of image field. C. Field of view. D. Image brightness.arrow_forward10. I want to build a telescope with lenses of focal lengths 20 cm and 1 cm. a. Which lens is most appropriate as the eyepiece (the one you look into)? Why? b. What should be the spacing between the lenses when I focus at a distant (treat as infinity) object? c. If I try to look at a closer object (say a bird in a tree), this means d. for the objective (first lens) is smaller, so d, for this same lens must now be longer. This means to focus on a closer object, I must increase the spacing between the two lenses. I make my telescope so I can lengthen the distance between the lenses by 2 cm. What is the closest object can I focus on?arrow_forward
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