Physics
A mirage occurs because of

Interference of light
Diffraction of light
Total internal reflection by layers of air
Reflection by hot ground

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Physics
Rain drops fall from great height. Which among the following statements is true regarding it?

They fall with same ultimate velocity
Their velocity increases and they fall with same velocity on the earth
Their velocity increases and they fall with different velocity on the earth
They fall with that ultimate velocity, which are different for different droplets

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