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so=3cm
R=12cm -> f=1/2R=1/2.12=6cm
jw:
a. Si=So.f/(So-f)
Si=3.6/(3-6)
Si=18/-3=-6cm
artinya Si=6cm dibelakang cermin (diruang 4)
b. So=3cm didepan cermin (diruang 1 yaitu ruang antara o dan f)
c. M=|si/so|
M=|-6/3|=2 kali
M=hi/ho
hi=ho. M =2.2=4 cm