Physics
The type of mirrors used in the headlamp of cars is

Parabolic concave
Plane
Spherical convex
Cylindrical concave

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Physics
Skating on ice is possible because

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

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Physics
'Mirage' is an example of

Total internal reflection of light only
Dispersion of light only
Refraction and total internal reflection of light
Refraction of light only

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