Distance of object/lens

  • Thread starter sp1974
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  • #1
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The homework problem is "A sharp image is located 68.0 mm behind a 56.0 mm focal length converging lens. Calculate the object distance in millimeters"



1/f = 1/di + 1/do



I tried solving based on having focal (f) and distance of image (di) so 1/56 mm = 1/(68 mm + 56 mm) + 1/do
I solved for do coming up with 102.04 mm and the computer doesn't accept
 
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Answers and Replies

  • #2
57
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Why is di=68+56?
 
  • #3
26
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I figured because the focal point was 56 and it says 68 behind it so I thought it would be f distance + the 68
 
  • #4
57
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It states it is behind a 56mm focal length lens. Not 68mm behind the focal length of a 56mm focal length lens.
 
  • #5
26
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I also did it as 1/56 = 1/68 + 1/do and the computer didnt accept that on as well
 
  • #6
26
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ok I figured this one out. I had my numbers flip flopped my numbers when subtracting
 

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