Question

1 . what is a screen 2 . what means virtual 3 . what is a real Image .

Answer 1

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. Because the rays never really converge, a virtual image cannot be projected onto a screen

Answer 2

screen:a fixed or movable upright partition used to divide a room, give shelter from draughts, heat, or light, or to provide concealment or privacy.
or,
a flat panel or area on an electronic device such as a television, computer, or smartphone, on which images and data are displayed.

virtual:almost or nearly as described, but not completely or according to strict definition.
or,
not physically existing as such but made by software to appear to do so.

real image: A real image occurs where rays converge, whereas a virtual image occurs where rays only appear to converge. Real images can be produced by concave mirrors and converging lenses, only if the object is placed further away from the mirror/lens than the focal point and this real image is inverted.

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