Difference between real and virtual focus?

Answer 1

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.)

Answer 2

Real focus refers to the actual physical point where light rays converge to form a sharp image, typically inside the camera or lens. Virtual focus, on the other hand, is the perceived point of focus in an image created using post-processing techniques or lens effects, despite the physical focus being elsewhere.