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, which lies adjacent to the eye.
_______cm
c)What is the power, P, of the contact lens (in diopters)?
_______diopters
Homework Answers
a) Near point. The closest
distance till which a person can clealy see is termed as near
point. For an average adult human it is 25 cms.
b) & c) Solution in image.
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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 67.2 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,...
A patient can't see objects closer than 32 cm and wishes to clearly see objects that...
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Goal Apply geometric optics to correct nearsightedness. Problem A particular nearsighted patient can't see objects clearly...
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A patient can't see objects closer than 32.5 cm and wishes to clearly see objects that...
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Exercise 31.33 Part A You're an optometrist helping a nearsighted patient who claims he can't see...
Exercise 31.33 Part A You're an optometrist helping a nearsighted patient who claims he can't see clearly beyond 70.0 cm . Prescribe a lens that will put the images of distant objects 70.0 cm , giving your patient clear vision at all distances beyond the normal near point. Express your answer using two significant figures. diopters Submit My Answers Give Up Provide Feedback Continue
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...
A physicist can see distant things clearly when wearing -2.00-diopter eyeglasses. Each lens rests 1.55 cm...
A physicist can see distant things clearly when wearing -2.00-diopter eyeglasses. Each lens rests 1.55 cm in front of the eye. (a) What focal length (in cm) describes the lenses? (b) Determine the far point (in cm) for this physicist's eyes. (c) is the physicist nearsighted or farsighted? nearsighted farsighted (d) The physicist decides to replace eyeglasses with contact lenses, one of which rests directly on each eye. What would the contact lens power be (in diopters) in order to...
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A patient can't see objects closer than 32.5 cm and wishes to clearly see objects that are 20.0 cm from his eye. (a) is the patient nearsighted or farsighted? O nearsighted O farsighted (b) If the eye-lens distance is 2.05 cm, what is the minimum object distance p from the lens? (Give your answer to at least three significant digits.) cm (c) What image position with respect to the lens will allow the patient to see the object? (Give your...
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