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Consider the following natural phenomena:

1. Terrestrial heating

2. Reflection of light

3. Refraction of light

4. Diffraction of light Due to which of these phenomena is a mirage formed ?

 (a) 1 and 2 (b) 2, 3 and 4 (c) 1 and 3 (d) 4 only

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(c) Convection currents of hot air rising off a surface have a lower density than the air directly above it. The difference in density cause light passing through the air to refract differently, which causes the formation of mirage.

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