Question

why virtual images cannot be obtained on screen

Answer 1

In optics, a virtual image is an imageformed when the outgoing rays from a point on an object always diverge. Theimage appears to be located at the point of apparent divergence. Because the rays never really converge, a virtual image cannot be projected onto a screen and it's erect and it can't be there on screen
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Answer 2

in optics a virtual image is an image firmed when the outgoing rays from a point on an object always diverge. the image appears to be located at the point of apparent diverges. because the rays never really converge a virtual image cannot be projected onto a screen.