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1/Si = 1/20 - 1/30
= 3/60 - 2/60
=1/60
Si = 60
Sifat cermin cembung adalah maya tegak dan diperkecil
Jadi jawabannya adalah a
2. 1/9 = 1/6 - 1/Si
1/Si = 1/6 - 1/9
= 9/54 - 6/54
= 3/54
= 1/18
Si = 18 (b)