CBSE Class 12 Physics Notes Chapter 9 Ray Optics and Optical Instruments
The real image of a body which is being positioned between the 2f and f from a convex lens can be captured on a screen which has been placed at the location of the image even if the screen is removed. The screen simply diffuses the rays from a given point on the object are converging to an image in space and again diverging away. The laser show projection is an appropriate example of this phenomena.
The formation of an image needs regular refraction/reflection. The rays generated from a single point is expected to reach the same image point. That is why certain types of objects such as the page of a book doesn’t produce an image. Please refer Ray Optics And Optical Instruments Class 12 Notes for more revision notes.
CBSE Revision Notes 