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- Mata dan Kacamata
Presbiopi, yang dimasalahkan hanya titik dekatnya
P = 2,75 D
PP = __ ?
P = 4 - 100/PP
2,75 = 4 - 100/PP
100/PP = 4 - 2,75
100/PP = 1,25
PP = 100 / 1,25 = 80 cm ← jwb [C]