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 ?

Question

2.4 $ \times $ 10⁸ m/s

3.0 $ \times $ 10⁸ m/s

1.2 $ \times $ 10⁸ m/s

1.8 $ \times $ 10⁸ m/s

Solution

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