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phy124:lab_7 [2010/04/01 23:31]
mdawber
phy124:lab_7 [2010/04/03 11:58] (current)
mdawber
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 If you need the .pdf version of these instructions you can get them [[http://​www.ic.sunysb.edu/​Class/​phy122ps/​labs/​dokuwiki/​pdfs/​phy124lab7.pdf|here]]. If you need the .pdf version of these instructions you can get them [[http://​www.ic.sunysb.edu/​Class/​phy122ps/​labs/​dokuwiki/​pdfs/​phy124lab7.pdf|here]].
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 ===== Video ===== ===== Video =====
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 Compare your obtained value of f with the nominal value of 5 cm, is it consistent? Compare your obtained value of f with the nominal value of 5 cm, is it consistent?
  
-Find the magnification from the measured heights of the image and object using $m=h_{o}/h_{i}$.+Find the magnification from the measured heights of the image and object using $m=h_{i}/h_{o}$.
  
 Calculate the error in the measured magnification from the errors in $h_{i}$ and $h_{o}$ using equation (E.7) in Error and Uncertainty.  ​ Calculate the error in the measured magnification from the errors in $h_{i}$ and $h_{o}$ using equation (E.7) in Error and Uncertainty.  ​
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 Move the lens to another position, closer to the screen, where you get a sharp image of a different size. Record the same data for that position. No errors are needed here. Move the lens to another position, closer to the screen, where you get a sharp image of a different size. Record the same data for that position. No errors are needed here.
  
-On the graph paper on your worksheet make a drawing – to scale as before – containing object and image arrows and the lens with object and image distance and the nominal focal length of 5 cm. Reconstruct in your drawing the image with the two principal rays (see Ch22 sheet 20). Get the measured magnification $m=h_{o}/h_{i}$  and compare it to the value obtained for your 1st lens position. ​+On the graph paper on your worksheet make a drawing – to scale as before – containing object and image arrows and the lens with object and image distance and the nominal focal length of 5 cm. Reconstruct in your drawing the image with the two principal rays (see Ch22 sheet 20). Get the measured magnification $m=h_{i}/h_{o}$  and compare it to the value obtained for your 1st lens position. ​
  
 === Image and Magnification for the 10 cm Diverging Lens: Qualitative only === === Image and Magnification for the 10 cm Diverging Lens: Qualitative only ===
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