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Determine image distance relative to lens

  • Thread starter phys62
  • Start date
  • #1
53
0

Homework Statement


Two identical diverging lenses are separated by 13 cm. The focal length of each lens is -6.5 cm. An object is located 3.0 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right.


Homework Equations


1/i + 1/o = 1/f

1/i = 1/f - 1/o

The Attempt at a Solution


1/i = 1/-6.5 - 1/3
i= -.487

13 + .487 = 13.487 cm

I feel like I'm not doing this right at all.. can someone please let me know if I'm even on the right track?
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
7
13 + .487 = 13.487 cm
This is the object distance for the second lens. Find the final image distance from the second lens.
 
  • #3
53
0
Ok so I took 1/13.487 + 1/i = 1/-6.5

and I solved for i and got -4.386 cm.

Is this correct, or should I have used -13.487 and got -12.547 as my answer?
 
  • #4
rl.bhat
Homework Helper
4,433
7
and I solved for i and got -4.386 cm.
This is correct.
 
  • #5
53
0
It's telling me that answer is incorrect.. I guess I'll try the -12.547 next
 
  • #6
rl.bhat
Homework Helper
4,433
7
1/i = 1/-6.5 - 1/3
i= -.487

Check this calculation.
 

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