A virtual picture will be produced by a concave mirror only if the item is directly in front of the focus point. If it is not, the image will be out of focus.
The image seen by the viewer is a virtual image because none of the objects behind the mirror are reflected back to them. Instead, all the objects appear in front of the mirror.
If you place an object beyond the focal point, there will be no image reflected back. The only thing that will be reflected back is the object itself. This means that any further objects would be duplicated multiple times until they reach the edge of the mirror.
For example, if you were to place a book beyond the focal point, it would continue to repeat itself indefinitely until it reached the edge of the mirror. Likewise, if you placed a person beyond the focal point, they would also continue to repeat themselves indefinitely until they reached the edge of the mirror.
However, since a virtual image is still being created, then the objects in the immediate vicinity of the focal point will appear to be closer than they actually are.
Only a concave mirror can provide a true picture, and this occurs only if the object is positioned at a distance larger than the focal length from the mirror's surface. For example, if the object is as close to the mirror as it would be if it were projected on to its surface, then there would be no image; instead, all that would be seen is what lies behind the mirror.
A convex mirror can reflect an image of an object, but only if it is placed at a sufficient distance from the object. If it is too close, nothing will be reflected; if it is too far away, then an incomplete image of the object will be reflected.
Thus, a concave mirror requires that the object be positioned at a distance such that the entire surface can be seen, while a convex mirror requires that the object be kept at a distance such that only part of it is visible at any one time.
These are the only two types of mirror that can provide a complete image of an object.
Mirrors do not provide images of objects, but rather reflections of objects back towards the eye of someone looking at them. Only a concave mirror can provide a true image because only then will everything about the object be in focus at once.
Regardless of the object's location, a convex mirror always provides a virtual picture. The mirror cannot form a real image because there is no real thing with which to form an image.
An image is said to be "virtual" when it isn't located in front of any object that would reflect light back to form the image. In other words, if something is blocking the path between you and the mirror, then the mirror is unable to provide a visual image of yourself. A virtual image can still be seen by looking at certain points on your body when you are photographed or filmed from behind.
For example, if there is a photographer standing behind you as you look into a mirror, you will see your own virtual image in the mirror. This shows that even though you aren't physically facing the mirror, you can still see yourself through the reflection. Your physical appearance matches up with where you look in the mirror - therefore, the image reflected is virtual.
A concave mirror does create a real image of yourself whenever possible. However, like a convex mirror, if something is blocking your line of sight with the mirror, you won't be able to see yourself in it.
Concave mirrors may create both actual and virtual pictures; they can be upright (virtual) or inverted (real); they can be behind the mirror (virtual) or in front of the mirror (real); and they can be expanded, decreased, or the same size as the item. In general, a concave mirror will reflect an image that is upright in relation to the mirror.
When reflected rays seem to collide, a virtual picture is generated. Such visuals are not possible to produce on a computer screen. A virtual picture is always formed by plane mirrors, convex mirrors, and concave lenses. Real objects cannot be placed in front of them since that would cause all the reflected images to disappear.
The image you see on a mirror is called its reflection. If you look at your own reflection in a mirror, you will see that it appears as a copy or image of yourself, rather than as something separate from you. Anything that reflects light will do this, including people, cars, and other objects. All these things are invisible to the human eye because they are not made of matter, which absorbs light energy; only atoms made of heavy elements such as gold, silver, copper, and platinum reflect light effectively.
An object's appearance changes when it moves toward or away from you. Because of this phenomenon, an observer on Earth sees the Moon as moving around the stationary Earth during a lunar eclipse. Even though the Moon is actually staying put and the Earth's shadow is falling over it, people see the whole scene moving because the Earth's rotation causes any point on its surface to appear as if it is moving relative to the fixed stars.
If you look into a mirror carefully, you can see that it is not completely reflective.