Question

why don't we use spherical concave mirror in headlight of vehicles​

Answer 1

Answer:

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Concave mirror are used in car headlamp. Concave mirror has converging power, it can concentrate the light ray at a particular point. And in night we want highly concentrated light beam for clear visibility. This is why concave mirror is used.

Answer 2

Answer:

We use concave miirror for clear scattering of light to see any objects.