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35. f = 12 cm
So = 15 cm
1/f = 1/So+1/Si
1/12 = 1/15 + 1/Si
1/Si = 1/12 - 1/15
1/Si = 5/60 - 4/60
1/Si = 1/60
Si = 60 cm (C)
36. f = 1/P (dimana f= fokus dan P= kekuatan lensa)
P = 1/f = 1/40 = 0,25 Dioptri (A)
37. Retina (A)