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1/f - 1/s = 1/s'
f-s/fs = 1/s' = fs/f-s = s'
2.3/2-3 = -6 kalau s' = -(Negatif bayangannya maya,tegak)
Semoga membantu
dit : Si (jarak bayangan)
1/Si = 1/f -1/So =1/2 -1/3 =1/6
jadi Si = 6 cm