Light travels a distance $\mathrm{x}$ in time $t_{1}$ in air and $10 \mathrm{x}$ in time $t_{2}$ in another denser medium. What is the critical angle for this medium?

Question

$\sin ^{-1}\left(\frac{10 \mathrm{t}_{2}}{\mathrm{t}_{1}}\right)$

$\sin ^{-1}\left(\frac{t_{1}}{10 t_{2}}\right)$

$\sin ^{-1}\left(\frac{10 t_{1}}{t_{2}}\right)$

$\sin ^{-1}\left(\frac{t_{2}}{t_{1}}\right)$

Solution

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