At what distance from the lens is the image

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When a punctual source of light is positioned at the focal point of a diverging lens, no real image is formed since the rays diverge. The discussion emphasizes that objects at the focal point do not produce an image with a diverging lens. Participants suggest using ray diagrams to illustrate the paths of light rays, noting that standard rays converge at the focal point, complicating the drawing. The conversation also touches on the behavior of converging lenses, where an object near the focal point does produce an image. Understanding the focal length and its implications for image formation is crucial in this context.
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Homework Statement


A punctual source of light is in the focal point of a diverging lens. in which distance from the lens is the image. Draw the road of rays.

Homework Equations


The objects at focal point don't have an image.

The Attempt at a Solution


http://s32.postimg.org/ociblmif9/image.png
So how should I draw the rays (it says in the problem)?
 
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My feeling would be to find the position of the image, then draw the ray paths accordingly.

You can find the image position using a formula, or, perhaps more interestingly, by drawing rays for an off-axis point at the focal distance. (The problem with the focal point being on-axis is that all the standard rays are coincident.)
 
annalian said:

Homework Statement


A punctual source of light is in the focal point of a diverging lens. in which distance from the lens is the image. Draw the road of rays.

Homework Equations


The objects at focal point don't have an image.
Are you sure? Where is the image if the object is very near to the focal point in case of a converging lens?
What do you know about the focal length of a diverging lens?
Where is the image if the object distance is do = |f|?
 
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