Physics
What is the reason for formation of Mirage in desert?

Both Refraction and Total internal reflection of light
Total internal reflection of light
Reflection of light
Refraction of light

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water at 4°C
Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 0°C
Density of the substance to the density of water

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