Focussing.
virtual
it is called an image
An image is called real if the light rays coming from a point(point on object) meet at a point after reflection or refraction. An image is virtual if the light rays do not actually meet after reflection or refraction. These rays appear to come from a point which is the point where we say virtual image is formed.
When light rays come together, they converge.
it will be called reflection
The most comon name for this is a mirage. Another such image, differently caused, is called a virtual image.
A real image can be captured on a screen (eg white paper) whereas a virtual image cannot.To see an image on a screen light rays must come to a focus on the screen, but with a virtual image no actual light rays come together at the location of the image .. hence a virtual image cannot be seen on a screen.A real image is a source of light energy .. rays of light radiate from it.A virtual image is not a source of light energy.. rays of light do not radiate from it ( although it's where the brain 'thinks' the light originated.)
Virtual image
An image is a copy of an object fromed by reflected (or refracted) rays of light.
Photon light ray
Real image
A Virtual Image