Why are mirrors used in search lights parabolic and not concave sphrical ?

Why are mirror is uded in search ligths parabolic and not concave spherical?

Assertion : The mirrorrs used in search lights are parabolic and not concave spherical. Reason : In a concave spherical mirrorr the image formed is always virtual.

Assertion : The mirrorrs used in search lights are parabolic and not concave spherical. Reason : In a concave spherical mirrorr the image formed is always virtual.

Why the mirrors used in search lights are parabolic, not concave spherical?

The mirror used in search lights is

Assertion and Reason. Mark the correct choice as:Assertion: The mirror used in serch lights are perabolic and not concave spherical. Reason: In concave spherical mirror the image the image formed is always virtual.

Why parabolic mirrors are use in search light?

What type of mirror is used in search lights and head lights of vehicles?