18) Which of the following best describes what we mean by the focal plane of a t

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18) Which of the following best describes what we mean by the focal plane of a telescope? 18) A) It is the lower surface of the telescope's primary lens or mirror. B) It is the surface of the lens on the eyepiece, through which you would look to see objects in the telescope's field of view. C) It is the upper surface of the telescope's primary lens or mirror. D) It is the place where, if we mounted film or an electronic detector, we could get a clear (nol blurry) image of an object viewed through the telescope. 19) Suppose you have two small photographs of the Moon. Although both look the same at small size, 19) when you blow them up to poster size one of them still looks sharp while the other one becomes fuzzy (grainy) looking. Which of the following statements is true? Aj The one that looks fuzzy at large size has better angular resolution (smaller) than the one that looks sharp. B) Both photographs have the same angular resolution, because they are both photographs of the same object that looks fuzzy same sizes in each case. C) The one that still looks sharp at large size has better (smaller) angular resolution than the one D) Both photographs have the same angular resolution, because they were both printed at the MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question 11) 11) Which of the following wavelength regions cam be studied with telescopes on the ground? A) radio, visible, and very limited portions of the infrared and ultraviolet regions B) infrared, visible, and ultraviolet light C) ail light with wavelengths shorter than infrared wavelengths D) all light with wavelengths longer than ultraviolet wavelengths 12) 12) What is the purpose of adaptive optics? A) to increase the magnification of telescopes on the ground B) to improve the angular resolution of telescopes in space C) to increase the collecting area of telescopes on the ground D) to eliminate the distorting effects of atmospheric turbulence for telescopes on the ground E to allow several small telescopes to work together like a single larger telescope 13) Which of the following is always true about images captured with X-ray telescopes? 13) A) They are always displayed in false color B) They are always useful for seeing through things C) They are always very pretty. D) They are always displayed with north pointing upward in the images E) They are always displayed with the highest possible angular resolution. Photo

Explanation / Answer

18. we mean by a focal plane of telescope that it is the place where we mounted film or an electronic detector we could get a clear(nt blurry) image of an object viewed through the telescope.

19. the one that still looks sharp at large size has better angular (smaller) resolution than the one that looks fuzzy.

11. here all the 4 options are correct.

the wavelength regions can be studied with the telescopes on the ground are-

A. radio,visible and very limited portion of infrared and ultraviolet regions

B. infrared ,visible,ultraviolet light.

C. all light with wavelength are shorter than infrared wavelength

D. all light with wavelength are longer than ultraviolet wavelength

12. the purpose of adaptive optics is to eleminate the distorting effects f the atmospheric turbulance for telescopes on the ground.

13. the images captured with X-ray telescopes are always displayed with the highest possible angular resolution.

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