A concave mirror of focal length 15 cm forms an image twice the size of the object. If the image is virtual, the distance of object is

A concave mirror of focal length produces an image m times the size of the object. If image is real, then the distance of the object from mirror is

An concave mirror of focal length 30 cm forms an image of double of the height of object. If the image is real then the distance of the object from image is

A concave mirror of focal length 20 cm forms an image having twice the size of object. For the virtual position of object, the position of object will be at

A concave mirror of focal length 0.15 m forms an in image doubled of the linear dimension of the object. If the image is virtual then the object distance—