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S' = 25 cm
menderita miopi
dit : jenis kacamata dan P ?
dijwb :
a. Penderita miopi ditolong dngn kaca mata berlensa cekung (-)
b. P = -100/S'
= -100/25
= - 4 dioptri
jadi jawaban b. Cekung -4 Dioptri