The near point of the eye is the closest distance at which the light from an objectis focused on the retina and is clearly seen, while the far point of the eye is the thegreatest distance for which a relaxed eye can clearly see. In the case of a nearsightedperson, the eyeball is too long and so when looking at an object beyond the far point,the image formed by the eyeball's lens focuses in front of the retina, and so the imagelooks blurry. In the case of a farsighted person the eyeball is too short, meaningthat when looking at an object closer than the near point, the image forms behind theretina. Optometrists and ophthalmologists usually prescribe corrective lenses measured in diopters; the power, P of a lens in diopters equals the inverse of the focal length, f,in meters, P =1/f.(a) A near point of a person's eye is 60.0 cm. To see objects clearly at a distance of25.0 cm, what should be the focal length and power of the appropriate correctivelenses? (Neglect the distance from the lenses to the eye).(b) Is the lens converging or diverging?

Near point = 60 cm Object distance (d) = 25 cm

Answered: (a) A near point of a person's eye is…

College Physics

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Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

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Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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(a) A near point of a person's eye is 60.0 cm. To see objects clearly at a distance of 25.0 cm, what should be the focal length and power of the appropriate corrective lenses? (Neglect the distance from the lenses to the eye). (b) Is the lens converging or diverging?