$[-/3$ Points$]$

WACALCPHYSMC $35\mathrm{.}8\mathrm{.}004.$

In order for total reflection to occur at an air$-$water boundary, which of the following must be true? $($The index of refraction of water is $1\mathrm{.}33$ and of air $1\mathrm{.}00)$

The light must be incident from air into water.

Neither air$-$into$-$water or water$-$into$-$air can produce total reflection.

Both air$-$into$-$water and water$-$into$-$air can produce total reflection.

The light must be incident from water into air.