1. Aug 28, 2005 #1

   Sanosuke Sagara

   

   I have my question,doubt and solution in the attachment that followed.Thanks for anybody that spend some time on this question.Sorry to say that the file format is *.zip .

    

   Attached Files:

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     optics question 2.zip

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   Sanosuke Sagara, Aug 28, 2005
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3. Aug 29, 2005 #2

   ehild

   

   Homework Helper

   Gold Member

   Well, the object distance is always positive if it is a real object, either it is in front of a concave or convex surface. The object image can be negative only when an image serves as an object for a second lens or surface and falls behind it. "In front" and "behind" is determined by the first lens. Where the object is, that is the "front side".
   
   ehild

    

   ehild, Aug 29, 2005

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