Question

Out of convex and concave lens , where focus is virtual and why?​

Answer 1

Answer:

In convex lens focus is virtual because convex lens “gathers” incoming parallel rays at its focus point, and rays coming in from an object will form a “real” image in the focus point behind the lens.

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Answer 2

Answer:

in concave lens the focus is virtual

Explanation:

in concave lens the paraxial light rays diverge but seem to be coming from a point & that's the virtual focus of lens