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Error in angular magnification calculation

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  1. Mar 26, 2015 #1
    1. The problem statement, all variables and given/known data
    The wing of an insect is 1.7 mm long. When viewed through a microscope, the image is 1.4 m long and is located 5.9 m away. Determine the angular magnification.

    2. Relevant equations
    di/do=hi/ho
    M=beta/alpha

    alpha=object size/object distance

    beta=image size/image distance
    3. The attempt at a solution
    di/do=hi/ho
    5.9/do=1.4/0.0017
    do=0.00716

    alpha=0.0017/0.00716=0.237

    beta=1.4/5.9=0.237
    M=1
    This answer is wrong. Can anyone please point out the mistake.
     
  2. jcsd
  3. Mar 26, 2015 #2

    haruspex

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  4. Mar 27, 2015 #3
  5. Mar 27, 2015 #4

    haruspex

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    Did you find the reference to 25 at the link?
     
  6. Mar 27, 2015 #5
    I have solved the question using 25cm for the distance. Thankyou for your guidance. Sorry earlier I was looking at the wrong portion of this link.
     
  7. Mar 27, 2015 #6

    haruspex

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    Ok, good.
     
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