When a patient is being fitted with contact lenses, the curvature of the patient's cornea is measured

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When a patient is being fitted with contact lenses, the curvature of the patient's cornea is measured with an instrument known as a keratometer. A lighted object is held near the eye, and the keratometer measures the magnification of the image formed by reflection from the front of the cornea. If an object is held 10.0 cm in front of a patient's eye, and the reflected image is magnified by a factor of 0.035, what is the radius of curvature of the patient's cornea?
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Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

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