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S' = 50 cm
dit : P dn jenis kaca mata ?
dijwb :
P = 4 - 100/S'
= 4 - 100/50
= 4 - 2
= 2 D
Ditolong dengan kacamata lensa cembung (+)
= 100/25 - 100/50
= 4 - 2
= +2 Dioptri