Physics
In radio-communication, the signals emitted by transmitting antenna are reflected on

Troposphere
Stratosphere
Ozonosphere
Ionosphere

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Physics
In total internal reflection, the light travel from

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

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