October 2018 2 20 Report
Sebuah benda diletakkan 10cm di
depan cermin cekung. jika bayangan nyata yg dihasilkan 3x lebih besar dari benda, jari jari kelenkungan cermin tersebut adalah...
a.10cm
b. 12cm
c. 15cm
d. 30 cm
tolong dibantu ya
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