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p = 1/f
1/ 0,5 = 2 +
lensa 2
p=1/f
1/0.25 = 4 +
karena positif maka lensanya adalah cembung :)
P=100/50
P=2 Dioptri
P=100/f (untuk cm)
=100/25
=4 Dioptri
B.sepertinya sih lensa cekung(untuk miopi)