Question

convex lens is said to have a real focus and a concave lens a virtual why?

Answer 1

here is your answer.
convex lens is said to have a real focus
because it is convergent lens . it absorb the light rays

concave lens a virtual because it is divergent lens.

hope this will help you

Answer 2

in convex lens the rays converge inside to meet at focus but in a concave lens the rays diverge outside and virtually meet at focus.
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