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S' = 100 cm
menderita Miopi
dit : P ?
dijwb :
P = -100/100
= - 1 D
catatan : tanda mines menunjukkan jns kacamata y dipakai (lensa cekung)
Pr = 100cm
Dit : kekuatan lensa (P)....?
jawab:
P = -100/Pr
P = -100/100
P = -1 dioptr1
Kekuatan lensanya - 1 dioptri