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
Concave mirror
Convex mirror
Plano-concave mirror

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Physics
Planets do not twinkle because

They emit light of a constant intensity
Their distance from the earth does not change with time
They are very far away from the earth resulting in decrease in intensity of light
They are nearer to earth and hence we receive a greater amount of light.

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