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cm
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1/Si = 1/f - 1/So
1/Si = (1/-30) - (1/-10)
1/Si = (1/-30) - (3/-30)
1/Si = (1/-30) + (3/30)
1/Si = (-1+3) / 30
1/Si = 2/30
Si = 30/2 --> 15 cm
*So = -10 cm (benda maya)
f = -30 cm (cermin cembung)
Lensa cekung = cermin cembung --> f = - (negatif)