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It is desired to magnify reading material by a factor of 3.0 X
when a book is placed 9.0 cm behind a lens. (a) Draw
a ray diagram and describe the type of image this would
be. (b) What type of lens is needed? (c) What is the power
of the lens in diopters?

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Ch. 35
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A thin plastic lens with index of refractionn = 1.69 has radii of curvature given by R, = -11.5 cm and R, = 30.0 cm. HINT (a) Determine the focal length in cm of the lens. -12.05 cm (b) Determine whether the lens is converging or diverging. O converging O diverging Determine the image distances in cm for object distances of infinity, 7.00 cm, and 70.0 cm. (c) infinity -12.05 By the sign conventions for thin lenses, the negative image distances indicate the images are formed in front of the lens (on the same side as the object). cm (d) 7.00 cm cm (e) 70.0 cm cm
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