Physics
Conservation of energy refers to the fact that

Energy cannot be created or destroyed but can be converted from one form to another
The entropy of the universe is always increasing
No chemical reaction is 100 percent efficient
If you conserve energy you will not be as tired

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Physics
'Mirage' is an example of

Refraction and total internal reflection of light
Refraction of light only
Total internal reflection of light only
Dispersion of light only

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