Problem: A farsighted person has a near point of 72 cm rather than the normal 25 cm. What strength lens, in diopters, should be prescribed to correct this vision problem?

FREE Expert Solution

Lens equation:

1so+1si=1f

Power of a lens:

D=1f

1 diopter = 1 m-1

The lens has to create an image that appears to be at the near point of the person's uncorrected vision:

si = -72 cm

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Problem Details

A farsighted person has a near point of 72 cm rather than the normal 25 cm. What strength lens, in diopters, should be prescribed to correct this vision problem?

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