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s' = -50 cm
1/s + 1/s' = 1/f
1/25 - 1/50 = 1/f
2/50 - 1/50 = 1/f
1/50 = 1/f
f = 50 cm
P = 100/f
P = 100/50
P = +2 D
Jawaban: D