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s' = -100
1/f = 1/s + 1/s'
1/f = 1/25 - 1/100
1/f = 4-1/100
f = 100/3 = 33,3 cm
P = 100/f = 100/33,3 = 3.003 dioptri
mohon dicek lagi,,maaf kalau salah