100 學年度指定科目考試物理考科 第 12 題

\sin\theta_1\le\frac{1}{\sqrt2}

\sin\theta_1\le\frac{1}{\sqrt3}

\sin\theta_1\le\sqrt{\frac{2}{3}}

\sin\theta_1\ge\frac{1}{\sqrt3}

\sin\theta_1\ge\frac{1}{\sqrt2}