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v₁ = 7 km/jam
v₂ = 10 km/jam
i = 30º
r = __ ?
sin i / sin r = v₁ / v₂
sin r = (v₂/v₁) sin i
sin r = (10 / 7) sin 30º
sin r = ⁵/₇
r ≈ 46° ← jwb
sudut bias 46° (pembulatan)