Physics
Which of the following is not caused by atmospheric refraction of light ?

Sun appearing higher in the sky than it actually is
Sun becoming visible two or three minutes before actual sunrise
Sun appearing red at sunset
Twinkling of stars at night

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Physics
Conservation of energy refers to the fact that

If you conserve energy you will not be as tired
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

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Physics
In total internal reflection, the light travel from

Rarer to denser medium and it occurs with no loss of intensity
Denser to rarer medium and it occurs with no loss of intensity
Rarer to denser medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with loss of intensity

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