Which describes the focus of a lens? A. A converging lens has a real focus; a di

Question

Which describes the focus of a lens?

A. A converging lens has a real focus; a diverging lens has a virtual focus.

B. A converging lens has a virtual focus; a diverging lens has a real focus.

C. A converging lens has a real focus; a diverging lens can have a virtual focus or a real focus, depending on the object distance.

D. A converging lens can have a real focus or a virtual focus, depending on object distance; a diverging lens has a virtual focus.

E. A converging lens has a virtual focus; a diverging lens can have a virtual focus or a real focus, depending on the object distance.

F. A converging lens can have a real focus or a virtual focus, depending on object distance; a diverging lens has a real focus.

If possible, please explain the correct answer.

Explanation / Answer

Real focus and virtual focus is the property of lens so it do not depend on the position of object

A Lens have a real focus which converges the light rays at a focal point at which we can see the light rays are meeting. And this kind of phenomena we observe in convex lens.

So converging lens have real focus. We take its focal length as positive

And Lens have a virtual focus through which light rays diverge and it looks like light is coming from a certain point but actually light rays do not meet. We observe this in Concave lens

So divergin lens has a virtual focus and we take its focal length as negative

So option A is correct

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