February 2019 1 117 Report
Sebuah lensa bikonkaf simetris berjari-jari 8 cm dan berindeks bias 1,5. jarak fokus lensa tersebut ketika berda di dalam medium yang berindeks bias 1,6 adalah (dalam cm) ....
a. -8
b. 8
c. 20
d. 64
e. -64
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