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1/f=1/15+1/30
1/f=1/10
f=10cm
S₁ = 30 cm
Ditanya = f..?
Jawab
1/f = 1/S₀ + 1/S₁
1/f = 1/15 + 1/30
1/f = 2+1/30
1/f = 3/30
f = 10 cm