Object Distance from Lens

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


An object is in front of a lens with a focal length of -15cm. An image ½ the side of the object is formed. How far is the object from the lens?


Homework Equations


m - magnification
q - distance from image
p - distance from object
f - focal length

m = -q/p
1/p + 1/q = 1/f


The Attempt at a Solution


m = -q/p so q = -(1/2)p

1/p + 1/q = 1/f
1/p + 1/(-1/2p) = 1/-15cm
-1/p = 1/-15cm
p = 15 cm
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
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Your answer is correct.
 
  • #3
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woohoo!
 

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