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Sn = 25 cm
P = 100/Sn - 100/PP
P = 100/25 - 100/100
P = 4 - 1
P = 3
Kekuatan lensa +3 Dioptri
S' = 100 cm
Sn = 25 cm
Ditanyakan : P ?
Dijawab :
P = 100/Sn - 100/S'
= 100/25 - 100/100
= 4 - 1
= 3 Dioptri
Ditolong dengan kacamata berlensa cembung