Matter and Interactions
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A man requires reading glasses with +2.15-D refractive power to read a book held 40.0 cm away with a relaxed eye.
Assume the glasses are 1.90 cm from his eyes.
His uncorrected near point is 1.00 m. If one of the lenses is the one for distance vision, what should the refractive power of the other
lens (for close-up vision) in his bifocals be to give him clear vision from 25.0 cm to infinity?
2.98 D
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Assume that the magnifier is held close to the eye. Use the standard near point of 25.0 cm to find the angular
magnification. An insect that is 4.10 mm long is placed 10.3 cm from a simple magnifier with a focal length of 13.0 cm.
What is the angular magnification?
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