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Chapter 26: Q13PE (page 956)
The power of a physician’s eyes is 53.0 D while examining a patient. How far from her eyes is the feature being examined?
The feature is 33.3 cm from the physician's eyes.
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What is the angular magnification of a telescope that has a100cm focal length objective and a2.50cm focal length eyepiece?
A 7.5binocular produces an angular magnification of-7.50 , acting like a telescope. (Mirrors are used to make the image upright.) If the binoculars have objective lenses with a 75.0cm focal length, what is the focal length of the eyepiece lenses?
If the cornea is to be reshaped (this can be done surgically or with contact lenses) to correct myopia, should its curvature be made greater or smaller? Explain. Also explain how hyperopia can be corrected.
Unless otherwise stated, the lens-to-retina distance is .
What is the power of the eye when viewing an object away?
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
(a) A laser vision correction reshaping the cornea of a myopic patient reduces the power of his eye by 9.00 D, with auncertainty in the final correction. What is the range of dioptres for spectacle lenses that this person might need after LASIK procedure? (b) Was the person near-sighted or farsighted before the procedure? How do you know?
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