When an object is placed at 30 cm in front of a concave mirror image of the same size is formed what is the focal length?

An object is placed at a distance of 30 cm from a concave mirror and its real image is formed at a distance of 30 cm from the mirror. The focal length of the mirror isA. 20 cmB. 15 cmC. 45 cmD. 30 cm

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