6.
f = focal length = - 36 cm
do = object distance = 19 cm
di = image distance
using the lens equation
1/di + 1/do = 1/f
1/di + 1/19 = 1/(-36)
di = - 12.4 cm
m = magnification = -di/do = -(-12.4)/19 = 0.65
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