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maaf klo slh
P = 2 D
So = 25 cm
dit :
f = ...?
P = 2
100/f = 2
100= 2f
f = 50 cm
1/Si + 1/So = 1/f
1/Si + 1/25 = 1/50
1/Si = 1/50-1/25
1/Si = 1/50 - 2/50
1/Si = -1/50
Si = -50 cm
atau maya 50 (dibelakang cermin)