Physics
If you look into a mirror and find that the image (your reflection) is smaller than you, then the type of the mirror is:

Plane mirror
Plano-concave mirror
Concave mirror
Convex mirror

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Physics
Lightning is produced when

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
Water vapour produces electricity in the clouds
Similar charges of electricity rush towards each other and then get repelled

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