(9%) Problem 8: A near-sighted person has a far point of 79 cm. 50% Part (a) What is the focal length (with its sign), in centimeters, of the corrective lens the person will need, if the lens is placed 2.0 cm from the eye? 50% Part (b) What would be the power, in diopters, of the contact lens needed? Assume the distance of the eye from the contact lens is zero. D =
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A near-sighted person has afar point of 80 cm. (a) What kind of corrective lens the person will need if the lens is to be placed $1.5 \mathrm{cm}$ from the eye? (b) What would be the power of the contact lens needed? Assume distance to contact lens from the eye to be zero.
A person with a nearsighted eye has near and far points of 14 cm and 33 cm, respectively. (a) Assuming a lens is placed 2.0 cm from the eye, what power must the lens have to correct this condition? diopters (b) Suppose contact lenses placed directly on the cornea are used to correct the person's eye. What is the power of the lens required in this case, and what is the new near point? Hint: The contact lens and the eyeglass lens require slightly different powers because they are at different distances from the eye. P = diopters new near point = cm
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