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s = 50
f = 20 cm
a) letak bayangan
s' = (s*f)/(s-f)
s' = (50*20)/(50-20) = 33,33 cm di depan cermin
b) tinggi bayangan
h' = (h*f)/(s-f)
h' = (12*20)/(50-20) = 8 cm