An object is kept in front of a concave ...

An object is kept in front of a concave mirror of focal length 15 cm. The image formed is three times the size of the object. The two possible distances of the object are

`u = -20 cm and u = - 10 cm`

`u = - 15 cm and u = - 10 cm`

`u = - 20 cm and u = - 30 cm`

`u = - 15 m and u = - 30 cm`

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