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Simple Nature - Light and Matter

Simple Nature - Light and Matter

Simple Nature - Light and Matter

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40 A nearsighted person is one whose eyes focus light toostrongly, <strong>and</strong> who is therefore unable to relax the lens inside hereye sufficiently to form an image on her retina of an object that istoo far away.(a) Draw a ray diagram showing what happens when the persontries, with uncorrected vision, to focus at infinity.(b) What type of lenses do her glasses have? Explain.(c) Draw a ray diagram showing what happens when she wearsglasses. Locate both the image formed by the glasses <strong>and</strong> the finalimage.(d) Suppose she sometimes uses contact lenses instead of herglasses. Does the focal length of her contacts have to be less than,equal to, or greater than that of her glasses? Explain.41 Fred’s eyes are able to focus on things as close as 5.0 cm.Fred holds a magnifying glass with a focal length of 3.0 cm at aheight of 2.0 cm above a flatworm. (a) Locate the image, <strong>and</strong> findthe magnification. (b) Without the magnifying glass, from whatdistance would Fred want to view the flatworm to see its detailsas well as possible? With the magnifying glass? (c) Compute theangular magnification.Problems 803

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