Re: [Phys-l] Image of object placed at focal point

["John Clement" <clement@hal-pc.org>]

I think it says the OBJECT is at a point, and does not use the word point in
regard to the image.  So do you mean the object at the focal plane?

John M. Clement
Houston, TX
> Isn't it a bit confusing to talk about an image being formed at a "point"
> ?
> Perhaps at a  "plane" .....but certainly not a dimensionless point!.
> That is ... unless it is not a real object at the source ???
> .... or as Confucius once said..."He who sits on the point of a tack,  is
> better off."
>
>
>
> > There are four textbook answers on the "properties" of image of an
> object
> > placed at the focal point in front of a converging lens.
> >
> > 1. No image is formed.
> > 2. 2 images are formed, one real and one virtual located at infinity.
> > 3. A virtual image located at infinity, upright and magnified.
> > 4. A real image located at infinity, inverted and magnified.
> >
> > Should there be only one correct answer? Or is there a better answer?