October 2018 1 36 Report
Jika dua buah lensa tipis yang nerjarak fokus masing masing 10cm dan -20cm digabungkan maka kekuatan lensa gabungannya adalah..
a. 10 dioptri
b. 5 dioptri
c. 2 dioptri
d. -5 dioptri
e. -10 dioptri

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