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The near point of a patient's eye is 54.2 cm. (a) What should be the refractive...

The near point of a patient's eye is 54.2 cm.

(a) What should be the refractive power ℛ of a corrective lens prescribed to enable the patient to clearly see an object at 23.0 cm?
ℛ =  dpt

(b) When using the new corrective glasses, the patient can see an object clearly at 26.8 cm but not at 23.0 cm. By how many diopters did the lens grinder miss the prescription?
? = dpt

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