An individual is nearsighted; his near point is 17.0 cm and his far point is 49.0 cm. (a) What lens power is needed to correct his nearsightedness? diopters (b) When the lenses are in use, what is this person's near point?
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An individual is nearsighted; his near point is 17.0 cm and his far point is 49.0 cm.
diopters
(b) When the lenses are in use, what is this person's near point?
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- Is this question set up wrong? I think the statement "The magnification of a book held 7.50 cm from a 10.0 cm-focal length lens is 3.00." is impossible using the lens equation 1/do + 1/di = 1/f and the equation for magnification m = -di / do.An individual is nearsighted; his near point is 11.0 cm and his far point is 51.0 cm. (a) What lens power is needed to correct his nearsightedness? 1.96 X The response you submitted has the wrong sign. diopters (b) When the lenses are in use, what is this person's near point? 11 X Your response differs from the correct answer by more than 10%. Double check your calculations. cmWhat is the power ? of the eye when viewing an object 41.0 cm away? Assume the lens-to-retina distance is 2.00 cm , and express the answer in diopters. Power???
- An optometrist needs to prescribe corrective lenses for a person whose near point is q = 58.8 cm. If the patient is to see objects clearly at a distance of p = 25.0 cm, calculate the following. (Neglect the distance from the lens to the eye.) (a) focal length (in cm) of the appropriate corrective lens cm (b) power (in diopters) of the appropriate corrective lens dioptersNeeds Complete solution with 100 % accuracy.Use the worked example above to help you solve this problem. The near point of a patients eye is 50.0 cm. (a) What focal length must a corrective lens have to enable the eye to see clearly an object 28.5 cm away? Neglect the eye-lens distance. 50 x cm (b) What is the power of this lens? 2 diopters (c) Repeat part (b), taking into account the fact that, for typical eyeglasses, the corrective lens is 2.00 cm in front of the eye. 2.26 X diopters
- Problem 12: A student wears eyeglasses of power P = -3.75 diopter to correct nearsightedness. The glasses are designed to be worn d = 1.3 cm in front of the eye. Part (a) Input an expression for the far point the student can see without correction, do. Part (b) Numerically, what is the distance in meters?A) how far from the object should this lens be placed? B) what focal length eyepiece would give an overall magnification of -55? C) what focal length eyepiece would give an overall magnification of -100?