An object is placed 20 cm from the concave mirror of focal length, 10 cm, then an image is formed?

The image is formed at the centre of the curvature of the mirror.
Given that,
The object distance,

u = - 20

, focal length,

f = - 10

.
The mirror formula is equal to,

\frac{1}{f} = \frac{1}{v} + \frac{1}{u}

Here, f = focal length, v = image distance and u = object distance.

\frac{1}{- 10} = \frac{1}{v} + \frac{1}{- 20}

- \frac{1}{10} = \frac{1}{v} - \frac{1}{20}

\frac{1}{v} = + \frac{1}{20} - \frac{1}{10}

\frac{1}{v} = \frac{1 - 2}{20}

\frac{1}{v} = \frac{- 1}{20}

The image distance is equal to,

v = - 20

, the image distance is equal to

20 cm

. The image is formed at the centre of the curvature of the mirror.
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An object is placed $20 cm$ from the concave mirror of focal length, $10 cm$ , then an image is formed?