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1/f=1/so+1/s'
1/f=1/12+1/20
1/f=10+6/120
1/f=16/120
f=120:16
f1=7,5
digeser 3cm menjauhi cermin maka mjd 15cm
Maka terletak pada 2f1
sifat bayangannya nyata,terbalik,sama besar