Q.

Optical fibre works on the principle of

A. refraction
B. scattering
C. interference
D. total internal reflection
Answer» D. total internal reflection
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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