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m = - s' / s
↔ s' = - m s
s' = - 2s = -50 cm
Persamaan lensa
1/f = 1/s + 1/s'
1/f = 1/25 + 1/(-50)
1/f = 2/50 - 1/50
1/f = 1/50
f = 50 cm
P = 100 / f
P = 100 / 50 = 2
fighting UNnya... semoga kita bisa diterima di SMA negeri ^-^