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Dit : s'
Jawab :
P = 1/f
f = 1,5 m = 150 cm
1/f = 1/s' + 1/s
1/s' = 1/f - 1/s
1/s' = 1/150 - 1/25
1/s' = 1/150 - 6/150
1/s' = -5/150
s' = 150/-5 = -30 cm