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cermin cekung
so = 20 cm
M = 3
R ?
jawab :
M = s/so
3 = s/20
s = 60 cm
R = 2f
R = 2(15) = 30 cm
jawaban no 6
cermin cembung
so = 15 cm
R = 60 cm
s ?
jawab :
-R = 2f
-60 = 2f
f = -30 cm