Physics
The phenomenon of light associated with the appearance of blue colour of the sky is

Scattering
Interference
Refraction
Reflection

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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
Rarer to denser medium and it occurs with 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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