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$? 20 / 20$ vision " is an arbitrary measure of vision $-$ meaning that you can read what an average person can read at a distance of 20 feet in daylight. What is this distance in meters?
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"20/20 vision" is an arbitrary measure of visionmeaning that you can read what an average person can read at a distance of 20 feet in daylight. What is this distance in meters?
A nearsighted man cannot clearly see objects more than $2.0 \mathrm{m}$ away. The distance from the lens of the eye to the retina is $2.0 \mathrm{cm},$ and the eye's power of accommodation is $4.0 \mathrm{D}$ (the focal length of the cornea-lens system increases by a maximum of $4.0 \mathrm{D}$ over its relaxed focal length when accommodating for nearby objects). (a) As an amateur optometrist, what corrective eyeglass lenses would you prescribe to enable him to clearly see distant objects? Assume the corrective lenses are $2.0 \mathrm{cm}$ from the eyes. (b) Find the nearest object he can see clearly with and without his glasses.
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