How can I determine the magnification of a lens?

[Johnny_99]

I do not know where to ask this question: For a lens (converging or Diverging), How do i know if magnification is positive or negative?

 

[berkeman]

Positive for converging, negative for diverging.

http://en.wikipedia.org/wiki/Lens_(optics)

 

[m2003]

Magnification is a measure of how much larger or smaller an image appears compared to the original object. In the case of lenses, the magnification can be positive or negative depending on the type of lens and the position of the object.

For a converging lens, the magnification will be positive when the image is upright and larger than the object. This is typically the case for lenses used in magnifying glasses or microscopes. On the other hand, if the image is inverted and smaller than the object, the magnification will be negative.

For a diverging lens, the magnification will always be negative as the image formed is always smaller and upright compared to the object. This is due to the fact that diverging lenses spread out the light rays, resulting in a smaller image.

To determine the magnification of a lens, you can use the formula: magnification = image height/object height. If the result is positive, the magnification is positive and if it is negative, the magnification is negative.

I hope this helps answer your question. If you have any further inquiries, please feel free to ask.