Diverging lens, calculating image location

  • Thread starter Revvi
  • Start date
  • #1
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Homework Statement



Diverging lens with focus of 2 meters. The object is 3.66 meters away from the lens. Find the exact image location.

Homework Equations



1/object + 1/image = 1/f

The Attempt at a Solution



I plugged in the numbers with a negative value for the focal length but I keep getting a negative value (-1.29 m) for my image location. However, when I do the ray diagram (which I'm confident is correct) I find that the image should be in front of the lens. Any explanations?
 

Answers and Replies

  • #2
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The usual sign convention for thin lenses is such that the image distance is negative if the image is in front of the lens.
 

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