Which mirror is used in the searchlights?

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Concave

Convex

Plane

Plano convex

answer is A.

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Detailed Solution

Concept- We require an intense parallel beam of light in search lights, and this is heavily dependent on the mirror's capacity to concentrate the beam of light. As the mirror collects the majority of the light when the bulb is placed on the focus, we need a curved mirror that can make all of the light rays parallel to the principal axis.
A concave mirror is a type of converging mirror that merely converges the light rays that fall on it at the focal point. It has an inwardly recessed reflecting surface that is distant from the incident light. A concave mirror merely converges the light rays inward at one focal point. A concave mirror is mostly used to focus light.
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We utilise the concave mirror for searchlights because we require a mirror that basically concentrates the light and when the bulb is placed at the focus, it diverges the light rays to form an intense parallel beam of light, which the concave mirror can do extremely well.
As a result, we can state that concave mirrors are employed in searchlights
Hence, option 1 is correct.

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