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s = 50 cm
f = 20 cm
a. letak bayangan (s')
s' = (fxs)/(s-f)
= (20x50)/ (50-20)
= 1000 / 30
= 33 cm
b. h'/h = f/(s-f)
h'/12 = 20/ 30
3 h' = 24
h' = 8 cm