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... ..........
si₁ = 30 cm
so₁ = 15 cm
so₂ = 15 cm - 3 cm
= 12 cm
ditanya =
si₂ = ...
dijawab =
1 / f = 1 / so₁ + 1 / si₁
= 1 / 15 + 1 / 30
= 2 / 30 + 1 / 30
1 / f = 3 / 30
f = 30 / 3
f = 10 cm
1 / f = 1 / so₂ + 1 / si₂
1 / si₂ = 1 / f - 1 / so₂
= 1 / 10 - 1 / 12
= 6 / 60 - 5 / 60
1 / si₂ = 1 / 60
si₂ = 60 cm (d)