Physics
'Mirage' is an example of

Total internal reflection of light only
Dispersion of light only
Refraction and total internal reflection of light
Refraction of light only

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Physics
The blue colour of sky is due to

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

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