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M= Si /So
1/5 = Si/So
So= 5.Si
1/f = 1/So + 1/Si
- 1/10 = 1/5Si - 1/Si
-1/10 = 1/5Si -5 / 5Si
-1/10 = -4/ 5Si
-5Si= -4.10
Si = 40 /5 = 8 cm
So= 5 .8= 40cm
ket = cermin cembung nilai f dan Si selalu negatif