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:

Plano-concave mirror
Plane mirror
Convex mirror
Concave mirror

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Physics
Stationary wave is formed by

Two waves of the same speed superposing
A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the opposite direction
Two waves of same frequency travelling in the same direction

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