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a. 1/20= 1/30+1/So
1/so= 5/60
So= 12cm
So= jarak bayangan
b. M=Si/So
M=30/12
M=2,5
terimakasih semoga bermanfaat
f = - 20 cm
a). s' = s. f / s-f = 30.20/30-(-20) = 600/50=12cm
b). M = s'/s = 12/30= 2/5 = 0,4
c). h' = M. h = 0,4. 10 = 4 cm