Created by StemPy LabWhich lens is used to correct astigmatism?
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← After an eye test, a girl is told that her far point is at 55 cm. The optician prescribes a thin lens to be worn right at her eye so that distant trees look sharp. What is the power of this lens?A retired teacher finds that the print of a book becomes sharp only when she holds it at least 45 cm from her eyes. Her optician fits a thin lens at the eye so that she can read at the usual distance of 25 cm. What is the power of that lens? →
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