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So = 100 cm
F = 20 cm
Ditanya = M?
Jawab =
1/Si = 1/F - 1/So
= 1/20 - 1/100
1/Si = 5/100 - 1/100 = 4/100 = 1/25
Si. = 25/1 = 25 cm
Maka,
M = Si/So
= 25/100
= 4 kali