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1/12=1/8+1/jb
1/jb=1/8-1/12
1/jb=3/24-2-24
1/jb=1/24
jb=24/1
jb=24 cm
the king GO,,
ruang j.benda+ruang j.bay=5
di soal benda di ruang 1 berarti bayangan di ruang 4(dibelakang lensa)