Index bias udara n₁ = 1
n₁.sin θ₁ = n₂. sin θ₂ .... (1)
v₂.sin θ₁ = v₁. sin θ₂ .....(2)
Bagi (1) dengan (2)
n₁/v₂ = n₂/v₁
v₂ = n₁/n₂. v₁ = 1/(4/3) . 30
v₂ = 3/4. 30 = 22,5 m/s
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Index bias udara n₁ = 1
n₁.sin θ₁ = n₂. sin θ₂ .... (1)
v₂.sin θ₁ = v₁. sin θ₂ .....(2)
Bagi (1) dengan (2)
n₁/v₂ = n₂/v₁
v₂ = n₁/n₂. v₁ = 1/(4/3) . 30
v₂ = 3/4. 30 = 22,5 m/s