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A farsihted man uses eyeglasses with a refractive power of 3.09 diopters. Wearing the glasses 0.027...

A farsihted man uses eyeglasses with a refractive power of 3.09 diopters. Wearing the glasses 0.027 m from his eyes, he is able to read books held no closer than 0.250 m from his eyes. He would like a prescription for contact lenses to serve the same purpose. What is the correct contact lens prescription, in diopters?

Solutions

Expert Solution

Given that power of the lens is P=3.09diaptors
hence the focal length of the lens is f=100/P
                                                         =32.36 cm
distance of the glass is d=2.7 cm
hence the focal length of the contact lens will be F=32.36+2.7cm=35cm
hence the power is P'=100/F
                                 =100/35cm
                                 =2.85 diopters

genius_generous answered 1 hour ago
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