I want to use a camera with an 80 mm lens to focus on objects anywhere from 2.5 m to infinity. What f - number should I use, and at what distance should I focus?
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- A nature photographer is using a camerathat has a lens with a focal length of 3.08cm. The photographer is taking pictures ofancient trees in a forest and wants the lens tobe focused on a very old tree that is 15.8 maway.a) How far must the lens be from the filmin order for the resulting picture to be clearlyfocused?Answer in units of cm. b-How much would the lens have to bemoved to take a picture of another tree thatis only 1.63 m away?Answer in units of cm.The punctum proximum of a certain child is 10.0 cm; its punctum remotum (with extended eyes) is 125 cm. Each ocular lens is 2.00 cm from the retina.at. Between what limits, measured in diopters, does the power of this lens-cornea combination vary?b. Calculate the power of the spectacle lens that the child should use for normal distance vision (i.e. punctum remotum = ∞). Is the lens converging or divergent?You desire to observe details of the Statue of Freedom, the sculpture by Thomas Crawford that is the crowning feature of the dome of the United States Capitol in Washington, D.C. For this purpose, you construct a refracting telescope, using as its objective a lens with focal length 90.1 cm. In order to acheive an angular magnification of magnitude 5.65, what focal length ?eshould the eyepiece have?
- A certain camera is able to focus on objects from 1.13 m to ∞o. Suppose you want to take an extreme close-up shot, with the camera 19 cm from the object. Find the focal length of a thin lens that could be placed directly in front of the camera lens such that the image of the close object would be in focus. (Let's denote the minimum and maximum values of the focal length by fmin and fmax, respectively.) 228 m -u I fmin = fmax = XXA certain LCD projector contains a singlethin lens. An object 18.2 mm high is tobe projected so that its upright image fillsa screen 2.04 m high. The object-to-screendistance is 1.44 m.Find the focal length of the projection lens.Answer in units of mm. How far from the object should the lens ofthe projector be placed in order to form theimage on the screen?Answer in units of mm.m At age forty, a man requires contact lenses (f= 65.0 cm) toread a book held 25.0 cm from his eyes. At age forty-five,while wearing these contacts he must now hold a book 29.0 cm fromhis eyes. (a) By what distance has his near point changed? (b) Whatfocal-length lenses does he require at age forty-fi ve to read a book at25.0 cm?
- A 35 mm camera equipped with a 45 mm focal length lens is used to photograph atree 15 m tall. The aperture of the lens is set at f/2. The aperture diameter at f/2 isclosest to:Two lenses with focal lengths, f1 = +5.0 cm and f2 = + 10.0 cm are located 5.0 cm apart. If an object2.50 cm high is located 15.0 cm in front of the first lens, find (a) the position and (b) the size of thefinal image. Include a diagram of the lenses all pertinent associated images. Ans. (a) +2.00 cm fromsecond lens (b) -1.0 cm1. 2. 3. What is the focal length of -4.50 D lens? Where is the focal point in the above lens and is it in front of or behind the lens? Would the image in the above lens be real or virtual?
- wo lenses are placed along the x axis, with a diverging lens of focal length −7.80cm on the left and a converging lens of focal length 13.0 cm on the right. When an object is placed 14.0 cm to the left of the diverging lens, what should the separation s of the two lenses be if the final image is to be focused at x = ∞?A nearsighted person cannot read a sign that is more than 5.2 mfrom his eyes. To deal with this problem, he wears contactlenses that do not correct his vision completely, but do allow him to readsigns located up to distances of 12.0 m from his eyes. What is the focallength of the contacts?Assume that the far point of a myopic (nearsighted) eye is 8.13 m in front of the eye. A lens is used to correct the vision, such that it can focus sharply an object at infinity. What is the power of the lens (in diopters; answer sign and magnitude)?