Which type of image of an object is formed by eye lens of the retina?

The image of an object formed by a plane mirror is

In a convex lens, if the object is placed at 2F (twice of the focal length), the image formed will be -

The change of focal length of an eye lens is caused by action of the

Which one of the following is not true about the image formed by a plane mirror?

Where should an object be placed in front of a convex lens to get a real and enlarged image of the object ?