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1/3=1+1/si
1-1/3=1/si
3/2=si
M=si/so
=3/2/1
=3/2 kali
f = - 3 cm (cermin cembung f bernilai -)
ditanyakan : Si dan M
+ =
+ =
= - 1
=
Si =
Si = cm di belakang cermin
M =
=
= kali