Physics
The blue colour of sky is due to

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

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Physics
Energy in reflected light :

Decreases with the increase in angle of incidence
Increases with the increase in angle
Does not depends on the angle of incidence
Becomes maximum for angle of incidence equal to 45°

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