If the initial He-Ne beam is 0.5 mm in diameter, the effective focal length of Lens L1 is 38 cm, what should the focal length of the microscope objective be in order to expand the beam diameter to 4 cm? Hint: Microscope objective and L1 make a Keplerian telescope.
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- An astronomical telescope has an objective with a focal length of 1.7 m and an ocular with a focal length of 5.8 cm. What is its angular magnification?Your camera’s zoom lens has an adjustable focal length ranging from 55 to 150 mm. Part (a) What is the maximum power of the lens, Pmax, in diopters? Part (b) What is the minimum power of the lens, Pmin, in diopters?Thank you so much in advance. The diagram shows a lens with a positive focal length 11 cm. (a) If we place an object at a distance of 25 cm from the lens, where will the resulting image position on the other side of the lens be found? Include units in answer, (b) With the object at 25 cm from the lens, what will the magnification be for the image at this position? (c) If we place an object at a distance of 4 cm from the lens, where will the resulting image position be found? (d) With the object at 4 cm from the lens, what will the magnification be for the image at this position?
- Seren andage Lere Hoe Li Soure and O and Lene Assume that a 10 cm focal length converging lens is placed in combination with a diverging lens in the lens holder. If do is 40 cm and d, is 42 cm, what is the focal length of the combo lens (fcombo )? What is the focal length of the diverging lens (fa )? Hint: The focal length of the diverging lens will be negative. fcombo cm f.When the muscles connected to the crystalline lens relax, the focal length is 9.0000 cm. With this focal length, how close must an object be to form sharply focused images on the retina? (Note: this distance is called the near point of vision.)An astronomical telescope has an objective with focallength 75 cm and a +25 D eyepiece. What is the totalmagnification?
- A small telescope has a concave mirror with a 2.6 m radius of curvature for its objective. Its eyepiece is a 3.4 cm focal length lens. Part (b) What angle (in degrees) is subtended by a 25,000 km diameter sunspot? Assume the sun is 1.50 × 108 km away. Part (c) What is the image angular size (in degrees) in this telescope?An amateur astronomer decides to build a telescope from two lenses. One of the lenses has a focal length of 10.0 cm, and the other has a focal length of 1.4 cm. (a) Which lens should be the objective, for maximum magnification? (b) What will be the magnification of the telescope? (c) How long will the telescope tube be if the telescope is focused on a flower that is 1.00 meter away? (Keep four significant figures for this.)Why is optical density greater than 1.0 considered inaccurate? What should be done?
- Photographs at a scale of S are required to cover an area X - mi square. The camera has a focal length and focal plane dimensions of 9 * 9in . If endlap is 60% and sidelap 30\% how many photos will be required to cover the area for the data given below? ▾ Part A S = 1/6500 ; X = 8 f = 152.4mn Express your answer as an integer.i POWer of a lens is +4 D. The Iens has a focal length of:A 1.38 m-long Galilean telescope has an eyepiece lens with focal length -4.58 cm. Determine the lens power of the telescope. Give your answer in m-1, correct to 2d.p.