October 2018 1 113 Report
Sebuah cermin cekung memiliki jarak titik api 30 cm. Benda di depan cermin cekung menghasilkwnn bayangan nyata pada jarak 90 cm. Besar jarak benda terhadap cermin cekung adalah...
a. 15 cm
b. 30 cm
c. 45 cm
d. 90 cm
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