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OPTIKA• pembiasan
indeks ᵤ untuk udara dan ₓ untuk 'suatu' medium
nᵤ = 1. vᵤ = 30 m/s
nₓ = 4/3. vₓ = __?
sin i / sin r = nₓ / nᵤ = vᵤ / vₓ
4/3 / 1 = 30 / vₓ
vₓ = 30 × ¾
vₓ = 22,5 m/s ✔️