Physics
The blue colour of sky is due to

Refraction of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Scattering of longer wavelengths of sunlight in the atmosphere
Reflection of sunlight

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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 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

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