Power of a lens:
si = 18mm(1m/1000mm) = 0.018 m
so = 20.0cm(1m/100cm) = 0.2 m
Suppose the distance from the lens system of the eye (cornea + lens) to the retina is 18 mm.
What must the power of the lens be when looking at an object 20.0 cm from the eye?
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