Question

What is areal image and virtual image?

Answer 1

Real images are ones that you can project onto a wall. The light rays actually converge for a real image and therefore you are able to place a screen at the intersection (on a ray diagram) and see the image. A virtual image cannot be projected because the light rays never converge, but your eyes and other similar devices like cameras can see this type of image because it traces back the light ray path to some imaginary intersection. For example, if your diverging lens caused the light rays of an object to bend away from each other such that there is no intersection on the exiting side, your eyes would trace those rays backwards to find an imaginary source that the light rays "must" have come from. This is the virtual image.