A long sighted person cannot see objects clearly at a distance less than 40 cm from his eye. the power of the lens needed to read an object at 25 cm is
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1/f = 1/do + 1/di
do= 25, di = -40
1/f = 1/25 + 1/(-40)
1/f = 0.01 = f = 100 cm
Power = 1/1m = +1.0 D ( converging lens)
1/f = 1/do + 1/di
do= 25, di = -40
1/f = 1/25 + 1/(-40)
1/f = 0.01 = f = 100 cm
Power = 1/1m = +1.0 D ( converging lens)
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