An optometrist tests a person and finds that without glasses, he needs to have his eyes...
An optometrist tests a person and finds that without glasses, he needs to have his eyes 15.0 cm from a book to read comfortably and can focus clearly only on distant objects up to 2.75 m away, but no farther. A typical normal eye should be able to focus on objects that are between 25.0 cm (the near point) and infinity (the far point) from the eye. (a) What type of correcting lenses does the person need: single focal length or bifocals? Why? (b) What should the optometrist specify as the focal length of the correcting contact lens or lenses? (c) What is the power (in diopters) of the correcting lens or lenses?
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An optometrist tests a person and finds that without glasses, he
needs to have his eyes...
A person can focus clearly only on objects between 33.5 cm and 51.5 cm from his...
A person can focus clearly only on objects between 33.5 cm and 51.5 cm from his eyes. Find the focal lengths of the correcting contact lenses needed to correct his closeup vision and distant vision. Find the powers of the correcting contact lenses needed to correct his closeup vision and distant vision. Answer in the order indicated. Separate your answers with a comma. You want to view an insect 2.20 mm in length through a magnifier. If the insect is...
A pair of glasses is designed for a person with a far-point distance of 2.5 m...
A pair of glasses is designed for a person with a far-point distance of 2.5 m so that she can read street signs 29.5 m away. (The far-point distance is the distance from the eye at which you are just able to properly focus a distant object.) (a) If the glasses are to be worn 1.0 cm from her eyes, what is the needed focal length? (b) Compare this focal length (find the percent difference) to the focal length she...
A pair of glasses is designed for a person with a far-point distance of 2.5 m...
A pair of glasses is designed for a person with a far-point distance of 2.5 m so that she can read street signs 29.5 m away. (The far-point distance is the distance from the eye at which you are just able to properly focus a distant object.) (a) If the glasses are to be worn 1.0 cm from her eyes, what is the needed focal length? (b) Compare this focal length (find the percent difference) to the focal length she...
Background information A person with normal vision can focus on objects as close as a few centimeters from the eye up...
Background information A person with normal vision can focus on objects as close as a few centimeters from the eye up to objects infinitely far away. There exist, however, certain conditions under which the range of vision is not so extended. For example, a nearsighted person cannot focus on objects farther than a certain point (the far point), while a farsighted person cannot focus on objects closer than a certain point (the near point). Note that even though the presence...
4)Aseverely nearsighted person needs corective lenses. In one eye, this person can focus on objects over...
4)Aseverely nearsighted person needs corective lenses. In one eye, this person can focus on objects over a range from as close as 15.8cm to as far away as 69.1cm. A) What strength (in diopters) contact lens would correct the vision in this eye? B) If instead of contact lenses, this person were to get glasses, the lenses of the glasses will sit a distance of 1.9 cm from the person's eye. What strength lens (in diopters) would be needed for...
Sometimes a person cannot clearly see objects close up or far away. To correct this type...
Sometimes a person cannot clearly see objects close up or far away. To correct this type of vision, bifocals are often used. The top half of the lens is used to view distant objects and the bottom half of the lens is used to view objects close to the eye. A person can clearly see objects only if they are located between 44 cm and 194 cm away from his eyes. Bifocal lenses are used to correct his vision. What...
Sometimes a person cannot clearly see objects close up or far away. To correct this type...
Sometimes a person cannot clearly see objects close up or far away. To correct this type of vision, bifocals are often used. The top half of the lens is used to view distant objects and the bottom half of the lens is used to view objects close to the eye. A person can clearly see objects only if they are located between 40 cm and 198 cm away from his eyes. Bifocal lenses are used to correct his vision. What...
With a near point of 15.0 cm, a nearsighted professor can focus on relatively nearby objects....
With a near point of 15.0 cm, a nearsighted professor can focus on relatively nearby objects. Yet, with a far point 62.0 cm out, he cannot clearly see distant objects without optical ald. (a) Calculate the focal length (in cm) of a contact lens that would enable this professor to clearly view very distant objects. (Hint: Allow p to approach Infinity in the thin-lens equation). (b) What power (in diopters) describes this contact lens? diopters (c) When this contact lens...
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,...
Sometimes a person cannot clearly see objects close up or far away. To correct this type...
Sometimes a person cannot clearly see objects close up or far away. To correct this type of vision, bifocals are often used. The top half of the lens is used to view distant objects and the bottom half of the lens is used to view objects close to the eye. A person can clearly see objects only if they are located between 36 cm and 160 cm away from her eyes. Bifocal lenses are used to correct her vision. What...
4)Aseverely nearsighted person needs corective lenses. In one eye, this person can focus on objects over a range from as close as 15.8cm to as far away as 69.1cm. A) What strength (in diopters) contact lens would correct the vision in this eye? B) If instead of contact lenses, this person were to get glasses, the lenses of the glasses will sit a distance of 1.9 cm from the person's eye. What strength lens (in diopters) would be needed for...
With a near point of 15.0 cm, a nearsighted professor can focus on relatively nearby objects. Yet, with a far point 62.0 cm out, he cannot clearly see distant objects without optical ald. (a) Calculate the focal length (in cm) of a contact lens that would enable this professor to clearly view very distant objects. (Hint: Allow p to approach Infinity in the thin-lens equation). (b) What power (in diopters) describes this contact lens? diopters (c) When this contact lens...
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