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1/8 + 1/24 = 1/f
3+1 = 4/24 = 24/4 = 6 cm (ini fokusnya)
24
So = 10 cm
fokus = 6 cm
Si= ?
1/10 + 1/Si = 1/6
1/Si = 5-3 = 2/30 = 30/2 = 15 cm (ini jawabannya)
30