Light is travelling from one medium to other medium as given in the options. In which of the following options total internal reflection will be possible?

Glass to water

The correct answer is Option (4) → Glass to water

The critical angle $(θ_c)$ for total internal reflection,

$\sin θ_c=\frac{μ_2}{μ_1}<1$

which is only possible when light is travelling from glass to water.