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s = 9 cm
f = 4 cm
m =....
h' =....
1/f = 1/s + 1/s'
1/4 = 1/9 + 1/s'
1/s' = 1/4 - 1/9
1/s' = 9/36 - 4/36
1/s' = 5/36 = 36/5
s' = 7,2cm
a. M= s'/s = 7,2/9 = 0,8 kali
b. h' = m x h
h' = 0,8 x 2 = 1,6 cm