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Why the mirrors used in search lights ar...

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

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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.

The mirror used in search lights is

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

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

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The light rays emanating from a point source situated at origin when reflected from the mirror ofa search light are reflected as beam parallel to the x-axis.Show that the surface is parabolic,by first forming the differential equation and then solving it.

In a reflecting astronomical telescope, if the objetcive (a spherical mirror) is replaced by a parabolic mirror of the same focal length and aperture, then