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2023 1 question

Light travels a distance $x$ in time $t_1$ in air and $10x$ in time $t_2$ in another denser medium. What is the critical angle for this medium?

2022 1 question

Two transparent media A and B are separated by a plane boundary. The speed of light in those media are $1.5\times10^8\ m/s$ and $2.0\times10^8\ m/s$, respectively. The critical angle for a ray of light for these two media is :