MCQOPTIONS
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MCQOPTIONS
| 1. |
A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 4.3. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of ball as\[[Take\text{ }g=10m/{{s}^{2}}]\] |
| A. | 9m/s |
| B. | 12m/s |
| C. | 16m/s |
| D. | 21.33 m/s |
| Answer» D. 21.33 m/s | |