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

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

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

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Physics
RADAR is used for:

locating submerged submarines.
locating geostationary satellites.
detecting and locating the position of objects such as Aeroplanes.
receiving a signals in a radio receiver.

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