Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Absence of gravity outside
Presence of gravity outside but not inside the spacecraft
Fact that spacecraft in the orbit has no energy
Acceleration in the orbit which is equal to the acceleration due to gravity outside

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Physics
In total internal reflection, the light travel from

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

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