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

Spherical convex
Plane
Parabolic concave
Cylindrical concave

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Physics
Should cars have bumpers that collapse under impact?

Yes, since the offending car should get damaged and pay for the mistake
No, since the colliding car would then ram into the occupants and kill them
No, since it would be very expensive to get the car repaired
Yes, since they help to absorb the impact of a collision and keep the occupants safe

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Physics
A white and smooth surface is

Bad absorber and good reflector of heat
Good absorber and bad reflector of heat
Bad absorber and bad reflector of heat
Good absorber and good reflector of heat

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