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s = 20 cm
f = 40 cm
Dit : s' ?
1/s' = 1/f - 1/s
1/s' = 1/40 - 1/20
1/s' = (1-2)/40
1/s' = -1/40
s' = -40
karena nilai s' adalah negatif, maka letak bayangan adalah maya dan berjarak 40 cm dibelakang cermin
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Salam - JelajahKampus