The image formed by a plane mirror is:

Virtual and erect

The image formed by a plane mirror is virtual and erect. This means the image appears upright and cannot be projected onto a screen. The light rays reflected from the mirror diverge, and the brain interprets them as originating from a point behind the mirror, forming a virtual image. The image is also of the same size as the object and located at an equal distance behind the mirror as the object is in front of it.

Explanation: In a plane mirror, the image formed has the following characteristics:

• The image is virtual because the light rays appear to meet at a point behind the mirror, but they do not actually converge.
• The image is erect, meaning it maintains the same orientation as the object, i.e., upright.
• The size of the image is identical to the size of the object, with no magnification or reduction.
• The image is laterally inverted, meaning the left and right sides are reversed.
• The image appears at the same distance behind the mirror as the object is placed in front of it.

Virtual and erect, as it accurately describes the properties of the image formed by a plane mirror.