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dit : h' = ?
jwb : 1/s' = 1/f - 1/s
1/s' = 1/18 - 1/12
1/s' = 2/36 - 3/36
1/s' = -1/36
s' = 36/1 = 36 cm
h' = s'/s x h = 36/12 x 10 = 30 cm