A nearsighted person has a near point of 25 cm and a far point of 45 cm. When he is wearing glasses to correct his distant vision, what is his near point?
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A nearsighted person has a near point of 25 cm and a far point of 45 cm. When he is wearing glasses to correct his distant vision, what is his near point?
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- Hand written solutions are strictly prohibited.A far-sighted person has a near point of 1.0 m. What prescription glasses are needed to correct her vision?An office administrator realizes that she is having trouble doing her work due to eyesight problems. Her optometrist determines that without glasses she can focus clearly only on objects that lie at distances between 0.500 m and 4.00 m. The optometrist decides that the best way to handle her eyesight problems is to prescribe bifocals that will give her normal visual acuity from 25.0 cm out to infinity. After trying on several pairs of glasses frames, they agree that the glasses will be a distance of 2.20 cm from her eyes. (a) Determine the refractive power needed for the bifocal part that will correct for her nearsightedness (include the sign). What type of lens is needed? converging diverging (b) Determine the refractive power needed for the bifocal part that will correct for her farsightedness (include the sign). D
- The focal length of the lens of a simple digital camera is 40 mm, and it is originallyfocused on a person 25 m away. In what direction must the lens be moved tochange the focus of the camera to a person 4.0 m away?A nearsighted man cannot see objects clearly beyond 20cm from his eyes. How close must he stand to a mirror inorder to see what he is doing when he shaves?An office administrator realizes that she is having trouble doing her work due to eyesight problems. Her optometrist determines that without glasses she can focus clearly only on objects that lie at distances between 0.450 m and 4.00 m. The optometrist decides that the best way to handle her eyesight problems is to prescribe bifocals that will give her normal visual acuity from 25.0 cm out to infinity. After trying on several pairs of glasses frames, they agree that the glasses will be a distance of 2.20 cm from her eyes. (a) Determine the refractive power needed for the bifocal part that will correct for her nearsightedness (include the sign). D What type of lens is needed? O converging O diverging (b) Determine the refractive power needed for the bifocal part that will correct for her farsightedness (include the sign). D What type of lens is needed? O converging diverging
- The distance between the lenses in a compound microscope is 18 cm. The focal length of the objective is 1.5 cm. If the microscope is to provide an angular magnification of - 68 when used by a person with a normal near point (25 cm from the eye), what must be the focal length of the eyepiece?A nearsighted man wears contact lenses of -3.00 diopters. With these lenses, his corrected near point is 25.0 cm. What is his uncorrected near point?During LASIK eye surgery (laser - assisted in situ keratomileusis), the shape of the cornea is modified by vaporizing some of its material. If the surgery is performed to correct for nearsightedness, how does the cornea need to be reshaped?