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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If the cornea is to be reshaped (this can be done surgically or with contact lenses) to correct (short sight) myopia, should its curvature be made greater or smaller? Explain.
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 clerk at the local grocery store wears glasses that make her
eyes look smaller than they actually are. Is the clerk nearsighted or
farsighted? Explain.
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
- Will the focal length of a lens change when it is submerged in water? Explain.arrow_forwardIf 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_forwardThe distance between the lenses in a compound microscope is 18 cm.The focal length of the objective is 1.5 cm. If the microscope is to providean angular magnification of -83 when used by a person with a normalnear point (25 cm from the eye), what must be the focal length of theeyepiece?arrow_forward
- A near-sighted person might correct his vision by wearing diverging lenses with focal length f� = -40 cmcm . When wearing his glasses, he looks not at actual objects but at the virtual images of those objects formed by his glasses. Suppose he looks at a 13-cmcm-long pencil held vertically 1.5 mm from his glasses. Use ray tracing to determine the location of the image. Express your answer with the appropriate units. Enter positive value if the image is on the other side from the lens and negative value if the image is on the same side. Use ray tracing to determine the height of the image. Express your answer with the appropriate units.arrow_forwardCan 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?arrow_forwardSam purchases +3.50 D eyeglasses which correct his faultyvision to put his near point at 25 cm. (Assume he wears thelenses 2.0 cm from his eyes.) Calculate (a) the focal lengthof Sam’s glasses, (b) Sam’s near point without glasses. (c) Pam,who has normal eyes with near point at 25 cm, puts on Sam’sglasses. Calculate Pam’s near point with Sam’s glasses onarrow_forward
- Let us assume that a given hypertropic eye has a near point 256cm. The desired lens is to allow the eye to view objects at 25cm. Find the focal length and power of the lens required to fix this problemarrow_forwardCan an image be larger than the object even though its magnification is negative? Explain.arrow_forwardA cataract-impaired lens in an eye may be surgically removed and replaced by a manufactured lens. The focal length required for the new lens is determined by the lens-lo-retina distance, which is measured by a sonar-like device, and by the requirement that the implant provide for correct distance vision. (a) If the distance from lens to retina is 22.4 mm, calculate the power of the implanted lens in diopters. (b) Since there is no accommodation and the implant allows for correct distance vision, a corrective lens for close work or reading must be used. Assume a reading distance of 33.0 cm, and calculate the power of the lens in the reading glasses.arrow_forward
- It has become common to replace the cataractclouded 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_forwardConstruct Your Own Problem Consider a telescope of the type used by Galileo, having a convex objective and a concave eyepiece as illustrated in part (a) of Figure 2.40. Construct a problem in which you calculate the location and size of the image produced. Among the things to be considered are the focal lengths of the lenses and their relative placements as well as the size and location of the object. Verify that the angular magnification is greater than one. That is, the angle subtended at the eye by the image is greater than the angle subtended by the object.arrow_forwardIn Example 25.7, the magnification of a book held 7.50 cm from a 10.0 cm focal length lens was found to be 3.00. (a) Find the magnification for the book when it is held 8.50 cm from the magnifier. (b) Do the same for when it is held 9.50 cm from the magnifier. (c) Comment on the trend in m as the object distance increases as in these two calculations.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