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| Q. |
Optical fibre works on the principle of |
| A. | refraction |
| B. | scattering |
| C. | interference |
| D. | total internal reflection |
| Answer» D. total internal reflection | |
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Explanation: Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open. |
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