Rankers Physics

Total Internal Reflection: Practice Problem & Solution

A small coin is resting on the bottom of a beaker filled with liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid ? Total Internal Reflection diagram: A small coin is resting on the bottom
\[2.4\times 10^{8}m/s\]
\[3.0\times 10^{8}m/s\]
\[1.2\times 10^{8}m/s\]
\[1.8\times 10^{8}m/s\]

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