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1/15 = 1/10 + 1/Si
1/15 - 1/10 = 1/Si
-1/30 = 1/Si
-Si = 30
Si = -30
So = 10 cm
f = 15 cm
1/f = 1/So + 1/Si
1/Si = 1/f - 1/So
= 1/15 - 1/10
= 2-3 per 30
1/Si = -1 per 30
Si = -30 cm
M = Si per So (mutlak)
= -30 per 10 (mutlak)
= 30 per 10
= 3 kali