A nearsighted man uses his ideally prescribed eyeglasses that have a refractive power of −3.50 diopters. He would like a prescription for contact lenses. What is the correct contact lens prescription if he normally wears his eyeglasses a distance of 2.2 cm from his eyes?
Lets find near point of his eyes,
-1/[d-2.2] = 1/f
d = -f+2.2
= 100/3.5 + 2.2
= 30.77 cm
for contact lens, object distance will be 30.77 cm = 0.3077 m
Power = -1/0.3077 = -3.25 D
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