Is the person seen through the window a virtual image or a real image? Why?

Of course it's true. People who see through the window can't see it.

The set of image points is called the image of the object. If the beam is divergent, the intersection of the opposite extension lines of the divergent beam is called a virtual image.

The difference between real image and virtual image is that real image is formed by real light (convergence) and virtual image is formed by real light (intersection of opposite extension lines). (Real) images can be presented on the screen, but (virtual) images can't.

The concept of real image and virtual image ① Real image: All refracted rays emitted by an object point can converge at one point, which is called the real image point of the object point, and the set of all real image points is called the image of the object. The characteristics of real images are: the actual light beams converge and stand upside down, which can be formed on the screen, as shown in Figure (8)(a). ② Virtual image: The light emitted by the object point is refracted by the lens. Its collection is called the virtual image of the object. The characteristics of virtual image are: it is not the convergence of actual light, it is upright, and it cannot form the same side on the screen. 2. Imaging law: the nature of object distance (P) image is opposite. 2f Reduce the inverse real image with P=2f; 2f >:p & gt； Enlarge the inverted real image p

So it's true! !