1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Archived Angular magnification and the magnifying glass

  1. Feb 17, 2013 #1
    1. The problem statement, all variables and given/known data

    An engraver uses a magnifying glass (f=9.5 cm) to examine some work. The image he sees is located 25 cm from his eye, which is his near point. A) what is the distance between the work and the magnifying glass? b) what is the angular magnification of the magnifying glass?

    2. Relevant equations

    M= (1/f -1/di)N
    1/di + 1/do = 1/f

    3. The attempt at a solution

    A) 1/25 + 1/do= 1/9.5 do= 15.3 cm

    b) m=(1/9.5 - 1/25) 25 M= 1.63


    Can some one check/ correct my work, not sure if I'm using the correct formulas. Thank you.
     
  2. jcsd
  3. Oct 29, 2016 #2

    Ibix

    User Avatar
    Science Advisor

    This is a virtual image. Using the sign convention you have, the image distance is negative. So $$\begin {eqnarray*}
    \frac 1{d_o}&=&\frac 1f-\frac 1{d_i}\\
    &=&\frac 1 {9.5}-\frac 1 {-25}\end {eqnarray*} $$I make that ##d_o=6.88##cm for part (a).

    Angular magnification is just ##M=-d_i/d_o##. Not sure what your formula is since you don't define N. In this case I make it 25/6.88=3.63 for part (b).
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Angular magnification and the magnifying glass
  1. Angular Magnification (Replies: 1)

Loading...