Concave Mirrors for Parallel Beams
Concave mirrors are used in devices like torches, searchlights, and vehicle headlights because of their ability to reflect light in a specific way.
When a light source (like a bulb filament) is placed at the focus of a concave mirror, the rays originating from the source strike the mirror and are reflected parallel to the principal axis. This reflection property creates a strong, focused, and parallel beam of light.
This parallel beam is ideal for illuminating distant objects effectively, which is the primary function of torches, searchlights, and headlights.
Therefore, concave mirrors are the type used for generating powerful parallel beams.
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