What do you mean by virtual, erect and real images?
Answers
in real, image is formed on screen but in virtual it can't form image on screen..
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An erect image, in optics, is one that appears right-side up. An erect image is formed by the actual intersection of rays. It is an image in which directions are the same as those in the object, in contrast to an inverted image.
In optics, a virtual image is an image formed when the outgoing rays from a point on an object always diverge. The image appears to be located at the point of apparent divergence. As the rays never really converge, a virtual image cannot be projected onto a screen. In diagrams of optical systems, virtual rays are conventionally represented by dotted lines. Virtual images are located by tracing the real rays that emerge from an optical device (lens, mirror, or some combination) backward to a perceived point of origin.
In contrast, a real image is one that is formed when the outgoing rays form a point converge at a real location. Real images can be projected onto a diffuse reflecting screen, but a screen is not necessary for the image to form.
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