A converging lens (one that is thicker in the middle than at the edges) or a concave mirror is also capable of producing a virtual image if the object is within the focal length.
Such an image is reduced in size when compared to the original object. A diverging lens (one that is thicker at the edges than the middle) or a convex mirror forms a virtual image.The image in a plane mirror is not magnified (that is, the image is the same size as the object) and appears to be as far behind the mirror as the object is in front of the mirror. Although the rays of light seem to come from behind the mirror, light from the source only exists in front of the mirror. A plane mirror forms a virtual image positioned behind the mirror.A real image can be projected onto a diffusely reflecting screen so people can see the image (the image on the screen plays as an object to be imaged by human eyes) In contrast, a real image can be projected on the screen as it is formed by rays that converge on a real location. In diagrams of optical systems, virtual rays are conventionally represented by dotted lines.īecause the rays never really converge, a virtual image cannot be projected onto a screen.
In other words, a virtual image is found by tracing real rays that emerge from an optical device ( lens, mirror, or some combination) backward to perceived or apparent origins of ray divergences. A real image is the collection of focus points made by converging rays, while a virtual image is the collection of focus points made by extensions of diverging rays. In optics, an image is defined as the collection of focus points of light rays coming from an object. Thus an image cannot be seen by placing a screen at the position of the virtual image. It can be seen on the right that the light rays appear to emanate from the virtual image but do not actually exist at the position of the virtual image. In both diagrams, f is the focal point, O is the object and I is the image, shown in grey. Bottom: The formation of a virtual image using a convex mirror. Top: The formation of a virtual image using a diverging lens.
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