COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 24, Problem 77QAP
To determine
What focal length and power of the lens would correct vision of Gbenga? What focal length and power of the lense would correct vision of Gbenga to focus on object that is 25 cm in front of his eyes? Will they be converging or diverging lenses?
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Can someone walk me through this problem:
A patient goes to the optometrist and complains that her contact lenses don’t work well any more, because even when she is wearing them, she is no longer able to focus on objects closer than about 30 cm. People with “normal vision” can focus on objects as close as 25 cm.
- Is the patient near-sighted or far-sighted?
- The optometrist inspects the contacts and finds that they have a focal length of +40 cm. Assuming the contacts worked correctly when she first got them, what was the patient’s near point at the time her old prescription was made?
- What should be the focal length for the new contact lenses prescribed by the optometrist?
A nearsighted person has a near point of 20.0cm and a far point of 60.0cm. When he wears his contact lenses, he can see faraway objects clearly. What is the closest distance at which he can see objects clearly when wearing his contact lenses?
give the answer in cm
A particular nearsighted patient can’t see objects clearly beyond 15.0 cm from their eye. Determine (a) the lens power required to correct the patient’s vision and (b) the type of lens required (converging or diverging). Neglect the distance between the eye and the corrective lens.
Chapter 24 Solutions
COLLEGE PHYSICS
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- If the cornea is to be reshaped (this can be done surgically or with contact lenses) to correct myopia, should its curvature be made greater or smaller? Explain.arrow_forwardIt has become common to replace the cataract-clouded lens of the eye with an internal lens. This intraocular lens can be chosen so that the person has perfect distant vision. Will the person be able to read without glasses? If the person was nearsighted, is the power of the intraocular lens greater or less than the removed lens?arrow_forwardA particular patients eyes are unable to focus on objects closer than 35.0 cm and corrective lenses are to be prescribed so that the patient can focus on objects 20.0 cm from their eyes. (a) Is the patient nearsighted or farsighted? (b) If contact lenses are to lie prescribed, determine the required lens power. (c) If eyeglasses are to be prescribed instead and the distance between the eyes and the lenses is 2.00 cm, determine the power of the required corrective lenses. (d) Are the required lenses converging or diverging?arrow_forward
- A converging lens has a focal length of 10.0 cm. Locate the object if a real image is located at a distance from the lens of (a) 20.0 cm and (b) 50.0 cm. What If? Redo the calculations if the images are virtual and located at a distance from the lens of (c) 20.0 cm and (d) 50.0 cm.arrow_forwardIf the lens of a person’s eye is removed because of cataracts (as has been done since ancient times), why would you expect a spectacle lens of about 16 D to be prescribed?arrow_forwardIn Figures CQ36.11a and CQ36.11b, which glasses correct nearsightedness and which correct farsightedness?arrow_forward
- Suppose you want to use a converging lens to project the image of two trees onto a screen. One tree is a distance x from the lens; the other is at 2%, as in Figure CQ23.7. You adjust the screen so that the near tree is in focus. If you now want the far tree to be in focus, do you move the screen toward or away from the lens? Figure CQ23.7arrow_forwardA measurement indicates that a patient cannot clearly see any object that lies closer than 60.8 cm to the patient's eye. (a) Which of the following terms best describes this distance? far pointnear point magnificationfocal length (b) The patient needs to be able to clearly see objects that are just 24.0 cm distant. A contact lens is made to order. What focal length (in cm) should this lens have? Assume the lens can be modeled as an ideal thin lens, which lies adjacent to the eye. cm (c) What is the power, P, of the contact lens (in diopters)? dioptersarrow_forwardDarcy suffers from farsightedness equally severely in both eyes. The focal length of either of Darcy's eyes is 18.9 mm in its most accommodated state (i.e, when the eye is focusing on the closest object that it can clearly see) What lens strength (a.k.a., lens power) of contact lenses should be prescribed to correct the farsightedness in Darcy's eyes? When wearing her contact lenses, Darcy's corrected near point should be 25.025.0cm. (Assume the lens-to retina distance of Darcy's eyes is 2.00 cm, and the contact lenses are placed a negligibly small distance from the front of Darcy's eyes) Answer choices: a) 2.45 D b) 1.09 D c) 1.37 D d) 3.49 D e) 1.92 Darrow_forward
- A nearsighted eye is corrected by placing a diverging lens in front of the eye. The lens will create a virtual image of a distant object at the far point (the farthest an object can be and still be in focus) of the myopic viewer where it will be clearly seen. In the traditional treatment of myopia, an object at infinity is focused to the far point of the eye. 1)If an individual has a far point of 68 cm, prescribe the correct power of the lens that is needed. (Express your answer to two significant figures.)arrow_forwardAn examination reveals that a patient cannot clearly see any object that lies closer than 52.0 cm to the patient's eye. (a) Which of the following terms best describes this distance? near pointfar point focal lengthmagnification (b) The patient needs to be able to clearly see objects that are just 23.0 cm distant. A contact lens is called for. What focal length (in cm) should this lens have? Assume the lens can be modeled as an ideal thin lens, which lies adjacent to the eye. cm (c) What is the power, P, of the contact lens (in diopters)? dioptersarrow_forwardWhich of the following statements is true about an eye that is nearsighted? a) The image is in front of the retina, and this can be corrected by a diverging lens. b) The image is in back of the retina, and this can be corrected by a diverging lens. c) The image is in front of the retina, and this can be corrected by a converging lens. d) The image is in front of the retina, and this can be corrected by a diverging lens.arrow_forward
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Convex and Concave Lenses; Author: Manocha Academy;https://www.youtube.com/watch?v=CJ6aB5ULqa0;License: Standard YouTube License, CC-BY