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Without corrective lenses, a person's far point is 17.2cm and the power of their relaxed eye...

Without corrective lenses, a person's far point is 17.2cm and the power of their relaxed eye is 51.2 D. A lens is placed 1.85cm away from the eye. What power will the lens be to allow them to see objects at a distance?

Can you explain why the relaxed eye has a power of +51.2? When they are nearsighted shouldn't diopters be negative??

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