A mirage is observed when

Density of air decreases with increase of height

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Density of air increases with increase of height

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Refractive index of air decreases with increase of height

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The Earth acts like a mirror.

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Solution

The correct option is B Density of air increases with increase of height
Mirage is seen in summer because the air near the ground becomes hotter (lower refractive index) than air further up (higher refractive index). Thus a ray of light from an object (tree) gets bent and is totally internally reflected. Observer assumes that it is reflected from ground.

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