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For a virtual image, rays from a single source point diverge after they pass through the lens. This means that a point on the image is no longer well-defined after the optical transformation. Realistically, what you'll see on a screen place at the other end of a diverging (concave) lens is a large haze of weak light (since the rays have ...
The virtual image for Interface 2 here actually means, that the image would have been there if the second interface did not alter the path of light. But due to interface 2, the position of (would have been image, l1) is changed to l. It is "would have been" image, not a virtual object.
They might actually intersect (real image) or one might have to geometrically produce them to get them to intersect (virtual image). One might always find that the real image is formed if this point of intersection is on the reflected/ refracted side. An object is a point of intersection of incident rays.
With virtual images, you don't usually have this problem with focusing because the image is, by definition, on the other side of the lens. You rarely put your eye that close to the lens and the image is even farther away. But if you put the object at 1 cm from the lens, the virtual image will also be ~1 cm in front of the lens.
Another image of your nose is... your nose. You can see both, but the mirror image is virtual (because the light from that image does NOT pass through the position inside the wall where the image is). The actual object, your nose, is not a mere 'image', but is a real image. Light from the nose actually does come from the position of the nose.
Assume a real image is made somewhere. Now if we place an optical device before the intersection point, that image now is like a virtual object for the new device. We can say a virtual object is like a defeated real image. Rays weren't able to intersect normally, instead, they go through another device. Now, assume a virtual image.
Virtual image is formed when the diverging rays appear to meet if they are projected backwards. In a real image, the rays converge, so if a screen is put at the point at which the rays converge, then the image can be vied on the screen. Our eyes have a convex lens which converges light rays.
A SINGLE refraction or reflection can form either REAL or VIRTUAL images of REAL or VIRTUAL objects; image and object always being in different media. We normally treat reflection as a special case of refraction, with the input side index being (1) and the output side index being (-1).
The mirror forms a virtual image of your, now when you are looking at the mirror on your image then a a real image of the mirror image is formed on your retina. 2) Suppose you are standing in front of a plane mirror holding a camera in your hand now when you capture the photo office looking in the mirror, the real image of the main images ...
To see a real image you have to stand at the focal point but you can view virtual images from different angles. NB, a real image would be formed on our retina but the eye is more like a camera and the screen is in the optic centre at the back of our brain. This is where the images we see are created. We see a virtual image of our surroundings.