An object is placed at a distance of 25 ...

An object is placed at a distance of 25 cm from a spherical mirror, its image is formed behind the mirror at a distance of 5 cm. The focal length and type mirror is

`+ 6.25 cm, concave`

`- 6.25 cm, concave`

`+6.25 cm, convex`

`- 6.25 cm, convex`

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