The focal length of convex lens is 30 cm and the size of image is quarter of the object, then the object distance is

The focal length of a convex lens is 30 cm and the size of image is quarter of the object.Them,the object distance is

The focal length of a convex lens is 30cm and the size of the real image is (1)/(4)th of the object. Then the object distance is

An object is placed in front of a convex lens of focal length 12 cm. If the size of the real image formed is half the size of the object, calculate the distance of the object from the lens.

An object of length 2.0 cm is placed perpendicular to the principal axis of a convex lens of focal length 12 cm. Find the size of the image of the object is at a distance of 8.0 cm from the lens.

An object of length 2.0 cm is placed perpendicular to the principal axis of a convex lens of focal length 12 cm. Find the size of the image of the object is at a distance of 8.0 cm from the lens.

The distance between the object and its real image from the convex lens is 60 cm and the height of image is two times the height of object . The focal length of the lens is