Homework Answers
For farsightedness, a person object should be placed at the location of minimum far sight. Since 40cm location should be observed at 400cm.
The value of power comes out to be positive. since optometrist suggests 2.21 D, converging lens.
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1. Mrs. Magoo is farsighted. She can only focus objects that are farther than 4 meters...
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an aging geography teacher cannot properly focus her eyes on a map if the map is any closer than 100cm from her eyes. what kind of corrective contact lens should be prescribed to the teacher so she is able to see the map placed 25 cm from her eyes? report the lens power in diopters with the proper sign. after using the contact lenses for a while the teacher from the previous problem decided to try prescription classes. it is...
34. In children's eyes, the lens is more flexible than in adults and may be fattened...
34. In children's eyes, the lens is more flexible than in adults and may be fattened enough to focus on objects that are very close. This near point for one young girl is 8 cm, while her far point (the furthest point she can focus with her lens completely relaxed) is 2 m. The distance from her lens to her retina is 2.00cm a) Between what limits, measured in diopters, does the power of her lens-cornea com bination vary? b)...
Prescribing Eyeglasses - Hyperopia Due this Friday, Mar 30 at 11:59 pm (EDT) Suppose you have...
Prescribing Eyeglasses - Hyperopia Due this Friday, Mar 30 at 11:59 pm (EDT) Suppose you have hyperopia (you are farsighted). You can clearly focus on very distant objects, but any object which is closer than 43.7 cm from your eyes will appear blurry unless you use glasses. The purpose of glasses would be to make objects that are close to you appear to be at your near point. What would be the refractive power (in diopters - do not enter...
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...
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...
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Velma is extremely nearsighted, and has difficulty seeing anything which is further away than 1.5 meters...
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A woman can read the large print in a newspaper only when it is at a distance of 63 cm or more from her eyes. (a) I...
A woman can read the large print in a newspaper only when it is at a distance of 63 cm or more from her eyes. (a) Is she nearsighted (myopic) or farsighted (hyperopic), and what kind of lens is used in her glasses to correct her eyesight? (b) What should be the refractive power in diopters) of her glasses (worn 2.5 cm from the eyes), so she can read the newspaper at a distance of 24 cm from the eyes?...
34. In children's eyes, the lens is more flexible than in adults and may be fattened enough to focus on objects that are very close. This near point for one young girl is 8 cm, while her far point (the furthest point she can focus with her lens completely relaxed) is 2 m. The distance from her lens to her retina is 2.00cm a) Between what limits, measured in diopters, does the power of her lens-cornea com bination vary? b)...
Prescribing Eyeglasses - Hyperopia Due this Friday, Mar 30 at 11:59 pm (EDT) Suppose you have hyperopia (you are farsighted). You can clearly focus on very distant objects, but any object which is closer than 43.7 cm from your eyes will appear blurry unless you use glasses. The purpose of glasses would be to make objects that are close to you appear to be at your near point. What would be the refractive power (in diopters - do not enter...
A woman can read the large print in a newspaper only when it is at a distance of 63 cm or more from her eyes. (a) Is she nearsighted (myopic) or farsighted (hyperopic), and what kind of lens is used in her glasses to correct her eyesight? (b) What should be the refractive power in diopters) of her glasses (worn 2.5 cm from the eyes), so she can read the newspaper at a distance of 24 cm from the eyes?...
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