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?
Answer & explanation
Correct answer: option 4
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.