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h = 4 cm
s = 20 cm
f= 15 cm
jawab: tinggi bayangan
1/f = 1/s + 1/s'
1/15 = 1/20 + 1/s'
1/s' = 1/15 -1/20 =4 /60 - 3/60
1/s' = 1/60
s'= 60 cm
s'/s = h'/h
h' = s'/s . h = 60/20 . 4 = 12 cm