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1/So +1/Si=1/f
1/10 + 1/Si = -1/30
1/Si = -1/30 -1/10
1/Si = (-1-3)/30
1/Si = -4/30
SI= 30/-4
Si = -7,5 cm
M= Si/So
=30/4 : 10
=30/4 x 1/10
=3/4 kali
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