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so= 18 cm
f = 12cm
dit : si,m,hi,r?
1/so+1/si=1/f
1/18+1/si= 1/12
1/si=1/12-1/18
1/si=3/36-2/36
1/si = 1/36
1si=36
si=36cm
M= SI/SO
= 36/18
= 2 cm
so/si=ho/hi
18/36=4/hi
18hi= 144
hi=144/18
hi=8
sifat bayangannya nyata,terbalik diperbesar
1/so+1/si=2/R
1/18+1/36=2/R
2/36+1/36=2/R
3/36 =2/R
3R=72
R=72/3=24