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v1 = kecepatan di medium 1 ( medium datang )
v2 = kecepatan di medium 2
n1 = indeks bias medium 1
n2 = indeks bias medium 2
perlu diketahui bahwa indeks bias udara = 1, dan indeks bias air = 4/3
v1.n1 = v2.n2
3x 10.1 = v2. 4/3
v2 = 3x . 4/3