What is the nature of the image formed when the object is placed at a distance of 20cm from a concave mirror of focal length 10 cm?

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Object distance (u) = - 20 m                           ( negative, due to sign convention)Focal length (f) = -10 m                                   ( negative, due to sign convention)Image distance = ?

From the mirror formula, we know that: 

`1/v+1/u=1/f` 

or `1/v+1/-20=(-1)/10` 

or `1/v-_20^1=_10^-1` 

or `1/v=(-1)/10+1/20` 

or `1/v=-1/20orv=-20m` 

Here, the negative sign means that the image is formed on the left side of the mirror. Thus, it is a real and inverted image, formed at a distance of 20 m from the mirror.