Bella and Asante now work a problem to determine whether they understand total internal reflection.

A thin film of water sits on top of a flat piece of glass. Note that nwater $=1\mathrm{.}333$ and nglass $=1\mathrm{.}52.$

For total internal reflection, does Asante say the light starts in the glass or in the water?

$"$In the glass, because the glass has a lower index of refraction""In the glass, because the glass has a higher index of refraction"$"$In the water, because the water has a higher index of refraction""In the water, because the water has a lower index of refraction"