A beam of light is traveling through a medium at 200,000 km/s. It enters a different medium and speeds up to almost 250,000 km/s. Finally, it enters a third medium and halts.

Question

What were the media the light traveled through, in order?

liquid, opaque solid, gas
opaque solid, gas, liquid
gas, liquid, opaque solid
liquid, gas, opaque solid

Answer 1

The media the light traveled through, in order, were:

gas, liquid, opaque solid