To obtain the powerful parallel beams of light from a vehicle's headlight, one must use

• front surface silvered plane mirror

• back surface silvered plane mirror

• concave mirror

• convex mirror

C.

concave mirror

Because a parabola allows the light rays to be focused as a single beam and gives more power to the light, so it is more efficient for seeing and being seen. If the mirror were spherical, the light would be scattered much more, which wasted energy and reduces efficiency