Physics
'Mirage' is an example of

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

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Physics
Which of the following is not a property of heavy water ?

It produces corrosion
Freezing point of heavy water is higher than that of ordinary water
Boiling point of heavy water is lower than that or ordinary water
Density of heavy water is higher than that of ordinary water

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