一束光从空气射入某透明介质，入射角为60°，折射角为30°。求该介质的折射率（空气折射率取1）。
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Correct answer
B. √3
Principle or equation
折射定律：n = sin i / sin r。
Why this answer is correct
n = sin60° / sin30° = (√3/2) / (1/2) = √3。
Example
若入射角45°，折射角30°，则 n = sin45°/sin30° = (√2/2)/(1/2)=√2。
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