Physics
Lightning is produced when

Similar charges of electricity rush towards each other and then get repelled
Water vapour produces electricity in the clouds
Clouds strike against impurities in air and the friction burns up these impurities
Strong opposite charges in different clouds break down the resistance offered by the intervening air

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Physics
'Mirage' is an example of

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

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