October 2018 2 30 Report
Sebuah sumber cahaya dipasang didepan cermin cekung menghasilkan sinar pantul yang sejajar. Jika jarak lampu ke pusat cermin 35cm, maka jari-jari kelengkungan cermin ... cm
A. 40
B. 45
C.50
D. 65
E. 70
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