which cannot be taken on a screen is called virtual image. When some object is placed very close to the concave mirror we don't get any image on the white screen placed behind the mirror. Such image is called virtual image.
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Answer:
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Explanation:
When some object is placed very close to the concave mirror we don't get any image on the white screen placed behind the mirror. Such image is called virtual image.
It seems like you've provided a statement about virtual images formed by a concave mirror. A virtual image is an optical image that is formed by the apparent intersection of rays of light that do not actually converge. In the context of concave mirrors, virtual images are formed when the reflected rays diverge, and their extensions appear to converge behind the mirror.
Your statement correctly describes the situation where, when an object is placed very close to a concave mirror, the reflected rays diverge, and they don't converge to form a real image on a screen. Instead, the observer perceives an apparent source of light rays behind the mirror, creating a virtual image.
In summary, a virtual image is an optical illusion created by the extension of reflected rays that appear to converge but do not actually meet. This phenomenon is common in concave mirrors and certain other optical systems.