because your ray diagrams having nothing in common with correct ones. To receive credit you will have to provide correct drawings of the four cases [ do is object distance] do >2 f; do=2f; 2f>do>f; do
This is not so tough because these ray diagrams are in the notes on geometric optics you were to have downloaded and read 3 weeks ago and that you'd better be reviewing for the final.
Andrew, Mike, Dennis, Steve and Anne Marie should also do this if they want decent grades for this lab.
Sorry for being so public, but I haven't been able to connect with the Bernards mail server today
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