Suppose a lens is placed in a device that determines its power as 2.92 diopters. (a)...
Suppose a lens is placed in a device that determines its power as 2.92 diopters.
(a) Find the focal length of the lens.
f = cm
(b) Find the minimum distance at which a patient will be able to
focus on an object if the patient's near point is 31.5 cm. Neglect
the eye-lens distance.
dmin = cm
Homework Answers
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Suppose a lens is placed in a device that determines its power
as 2.92 diopters.
(a)...
An optometrist determines that a patient cannot clearly see any object that lies closer than 67.6...
An optometrist determines that a patient cannot clearly see any object that lies closer than 67.6 cm to the patient's eye. (a) Which of the following terms best describes this distance? Focal length, Near point, Far point, Magnification 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,...
Goal Apply geometric optics to correct nearsightedness. Problem A particular nearsighted patient can't see objects clearly...
Goal Apply geometric optics to correct nearsightedness. Problem A particular nearsighted patient can't see objects clearly when they are beyond 24 cm (the far point of the eye). (a) What focal length should the prescribed contact lens have to correct this problem? (b) Find the power of the lens, in diopters. Neglect the distance between the eye and the corrective lens. Strategy The purpose of the lens in this instance is to take objects at infinity and create an image...
An optometrist determines that a patient cannot clearly see any object that lies closer than 67.2 cm
An optometrist determines that a patient cannot clearly see any object that lies closer than 67.2 cm (a) Which of the following terms best describes this distance? far point ncar point magnification focal length (b) The patlent needs to be able to clearly see objects that are just 23.0 cm distant. A contact lens is prescribed. 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. (c) What is the power,...
The crystalline lens of the human eye is double convex and has a typical range of...
The crystalline lens of the human eye is double convex and has a typical range of optical power from 110 diopters to 150 diopters . Part A What is the range of focal lengths the eye can achieve? Enter your answers in millimeters, separated by a comma, to three significant figures. Part B At minimum power, where does it focus the image of a very distant object? Give your answer as the distance, in millimeters, from the crystalline lens of...
The near point of a person's eye is 56.0cm. (Neglect the distance from the lens to...
The near point of a person's eye is 56.0cm. (Neglect the distance from the lens to the eye.) (a) To see objects clearly at a distance of 26.0cm, what should be the focal length of the appropriate corrective lens? cm (b) To see objects clearly at a distance of 26.0cm, what should be the power of the appropriate corrective lens? diopters
9) A converging lens has a lens power of 12 diopters. An object is placed 9.5...
9) A converging lens has a lens power of 12 diopters. An object is placed 9.5 meters in front of the lens and an image forms at some magnification. The converging lens is then replaced with a lens with a lens power of 90 diopters and the object is moved so the image is formed in the same image position as the first lens. How many times larger is the image formed from the first lens compared to the second...
The near point of an eye is 111 cm. A corrective lens is to be used...
The near point of an eye is 111 cm. A corrective lens is to be used to allow this eye to focus clearly on objects 25.0 cm in front of it. What should be the focal length of this lens? What is the power of the needed corrective lens (in diopters)? Do not enter units.
3. An optometrist measures the power of a lens in diopters (D). Define diopters When your...
3. An optometrist measures the power of a lens in diopters (D). Define diopters When your eye is relaxed, does the lens have its largest or shortest focal length? In this state, can you see more clearly at a distance or up close? Is the lens at its fattest or thinnest? 4.
9) A converging lens has a lens power of 12 diopters. An object is placed 7.2...
9) A converging lens has a lens power of 12 diopters. An object is placed 7.2 meters in front of the lens and an image forms at some magnification. The converging lens is then replaced with a lens with a focal length of 100 meters and the object is moved so the image is formed in the same image position as the first lens. How many times larger is the image formed from the first lens compared to the second...
Each of your eyes has a lens in it. This lens can change its shape and...
Each of your eyes has a lens in it. This lens can change its shape and hence its focal length. By changing the focal length you are able to focus on an object based on how far away it is from you. For this problem you will determine the minimum focal length of your eye. A. Hold an object out in front of you at arm's length. Close one eye and bring the object towards your eye and determine how...
Goal Apply geometric optics to correct nearsightedness. Problem A particular nearsighted patient can't see objects clearly when they are beyond 24 cm (the far point of the eye). (a) What focal length should the prescribed contact lens have to correct this problem? (b) Find the power of the lens, in diopters. Neglect the distance between the eye and the corrective lens. Strategy The purpose of the lens in this instance is to take objects at infinity and create an image...
3. An optometrist measures the power of a lens in diopters (D). Define diopters When your eye is relaxed, does the lens have its largest or shortest focal length? In this state, can you see more clearly at a distance or up close? Is the lens at its fattest or thinnest? 4.
Each of your eyes has a lens in it. This lens can change its shape and hence its focal length. By changing the focal length you are able to focus on an object based on how far away it is from you. For this problem you will determine the minimum focal length of your eye. A. Hold an object out in front of you at arm's length. Close one eye and bring the object towards your eye and determine how...
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