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f = 12 cm
M = 2
Dit : so
Jawab :
(menggunakan persamaan)
1/f = 1/so + 1/si
1/12 = 1/so + 1/2so
1/12 = 2/2so + 1/2so
1/12 = 3/2so
2/36 = 1/so
so = 36/2
so = 18 cm