What is a virtual image? Give one situation where a virtual image is formed.
When an image cannot be obtained on a screen, it is called a virtual image.
The image formed by a plane mirror is virtual, because the image cannot be obtained on a screen when placed either in front of the mirror or behind it.
The image 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.