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f= 100 / p
= 100 / 1,5
Si = - 100
1/So = 1/f - 1/Si
= 1/(100/1,5) - (-1/100)
=1,5 / 100 + 1/100
=2,5 / 100
So = 100/2,5 = 40 cm
M = Si / So
= 100 / 40
= 2,5 kali