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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?
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- 2.4 × 108 m/s
- 3.0 × 108 m/s
- 1.2 × 108 m/s
- 1.8 × 108 m/s
Correct Option: D
Hypotenuse comes out to be 5 cm.
| Since , | = | |||
| μ | sin 90° |
| μ = | = | |||
| sin i | 3 |
| Speed , v = | = | = 1.8 × 108 m / s | ||
| μ | 5 / 3 |
