At what distance from the lens is the image

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SUMMARY

The discussion centers on the behavior of light through a diverging lens when a punctual source of light is placed at the focal point. It is established that objects located at the focal point of a diverging lens do not produce a real image. Instead, the image formed is virtual and appears on the same side as the object. Participants suggest using ray diagrams to illustrate the path of light rays and emphasize the importance of understanding the focal length of diverging lenses in this context.

PREREQUISITES
  • Understanding of diverging lens properties
  • Familiarity with ray diagrams in optics
  • Knowledge of focal length concepts
  • Basic principles of light behavior through lenses
NEXT STEPS
  • Study ray tracing techniques for diverging lenses
  • Learn about the lens maker's equation for calculating focal lengths
  • Explore the differences between converging and diverging lenses
  • Investigate virtual images and their characteristics in optical systems
USEFUL FOR

Students studying optics, physics educators, and anyone interested in understanding the principles of light behavior through lenses, particularly in the context of diverging lenses.

annalian
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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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