Physics
Fibre optics work on the principle of

Total internal reflection
Scattering of light
Total internal absorption
Optical rotation

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Physics
The term ''equinox' means

The axis of the Earth around which it rotates
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon
The path which the Earthtakes around the Sun
When the day and night are of equal duration

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