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
Skating on ice is possible because

The pressure on the ice due to skate raises its melting point
Ice is cold
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
The surface of ice is smooth

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