Explain how does a convex lens produce real image from virtual object​

Real images are formed where rays of light actually converge, whereas virtual images occur with they are perceived to converge. Real images can be produced by passing light through converging lenses or with a concave mirror of some sort.

Explanation:

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when the object passes the rocal point of the lens , the image becomes virtual , erect, magnified and on the same side of the lens .

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what type of charge does it have? negative