Saturn is viewed through the Lick Observatory refracting telescope (objective focal length 18 m). If the diameter of the image of Saturn produced by the objective is 1.7 mm, what angle does Saturn subtend from when viewed from Earth?
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- What is the angular size of the Moon if viewed from a binocular that has a focal length of 1.2 cm for the eyepiece and a focal length of 8 cm for the objective? Use the radius of the moon 1.74106 m and the distance of the moon from the observer to be 3.8108m .What is the magnification of a magnifying lens with a focal length of 10 cm if it is held 3.0 cm from the eye and the object is 12 cm from the eye?What will be the angular magnification of a convex lens with the focal length 2.5 cm?
- Saturn has an angular diameter of 20 arcseconds (9.7×10-5 rad). You want to observe Saturn with a telescope. The focal length of the telescope’s objective is 1100 mm. To see Saturn’s rings clearly, you want the telescope to have a magnification of -50. What is the focal length of the eyepiece you need for this observation? What is the distance between the objective and the eyepiece?Use the astronomical data provided in this text to compute the angular size of Jupiter as seen from earth when the distance from earth to Jupiter is the same as the distance from the sun to Jupiter. Your telescope’s objectivelens has a focal length of 700 mm, and you use a 10 mm eyepiece to view Jupiter. What is the angular size of the image?As magical as the world of Middle-Earth may be, it is still subject to the laws of nature. An individual Dwarf stands approximately 1.24 m tall and is approximately 702.3 km away from Barad-dûr, where the Eye of Sauron is perched. To what aperture must the Eye of Sauron’s rectangular pupil be opened in order to be able to resolve the head of the individual from the ground? (Ignore the width of the individual and assume an average wavelength of 580.0 nm.)
- A certain telescope has an objective of focal length 1 500 cm. If the Moon is used as an object, a 1.0-cm-long image formed by the objective corresponds to what distance, in miles, on the Moon? Assume 3.8 x 10 8 m for the Earth–Moon distance.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.If the object is 10 m away and the image is 9.8 cm, what is the focal length? (Hint: use Lab Manual Equation 4.2: 1 / o+ 1 / i = 1 / f) Suppose one estimated the focal length by assuming f = i. What is the discrepancy between this approximate value and the true value?
- 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?An object is placed 17 cm in front of a converging lens with focal length 10 cm. A second lens, with focal length -20 cm is behind the first lens by a distance x = 13 cm. What is the final magnification of the image when viewed through both lenses? Be sure to include a minus sign if it is appropriate, and express your answer with at least two decimal places.The diameter of a penny is 19 mm. As we’ve seen, the moon subtends an angle of approximately 0.5° in the sky. How far from your eye must a penny be held so that it has the same apparent size as the moon?