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P = 1/F
P = kekuatan lensa
F = Jarak fokus (m)
30 cm = 0,3 m
1/ 0,3 = 3,4 dioptri
dit:p=?
jwb= p=100 : f
p=100 : 30cm
p= 3,333 dioptri atau 3,4 dioptri