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M = -2,75 = -s'/s
s' = 2,75 s
1/f = 1/s + 1/s'
1/75 = 1/s + 1/2,75 s
= 3,75/2,75s
s = 3,75 x 75/2,75
= 102,27 cm
d(jarak) = s' + s
= 3,75 s
= 383,52 cm