The relation between object distance (u) , image distance (v) and focal length (f) for a concave mirror is :

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\frac{1}{v}

\frac{1}{u}

\frac{1}{f}

\frac{1}{v}

\frac{1}{u}

\frac{1}{f}

\frac{1}{v}

\frac{1}{u}

\frac{1}{f}

None of these

answer is A.

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Detailed Solution

Concept: An inwardly recessed reflecting surface is characteristic of a concave mirror, also known as a converging mirror (away from the incident light). One focal point is illuminated internally by concave mirrors. To focus light, they are employed. Concave mirrors display several picture types based on the object's distance from the mirror, in contrast to convex mirrors.
The principles of reflection also apply to concave mirrors, but because of the inclined surface, the angle at which light strikes the surface varies depending on which part of the mirror it is. A common term for the mirror's angle is incidence angle.
Similar to how a camera lens screens light and shapes an image, the concave mirror allows light to be condensed. In contrast to a flat mirror, concave mirrors may reflect images where the light is focused, creating actual pictures.
Next to the mirror, it causes an illusion to float in the air! The fact that you don't even need to look into the mirror to see this item makes it a true image.
The mirror equation, using the sign convention, provides the relationship between object distance, image distance, and focal length for a concave mirror.
So, the correct answer is