Angular magnification, given F and di

AI Thread Summary
The discussion focuses on calculating the angular magnification of a magnifying glass used by a jeweler with a near point of 40.0 cm and a lens focal length of 5.00 cm. The formula used is 1/f = 1/do + 1/di, leading to the angular magnification equation M = (1/f - 1/q)N.P. The user initially calculated the magnification as 7.76 cm but later corrected it to 8.24 cm. The confusion arose from the unit of measurement, emphasizing the importance of accuracy in calculations. The thread highlights the challenges faced in understanding optical magnification concepts.
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A Jeweler, whose near point is 40.0cm from his eye, is using a magnifying glass to examine a gold ring. The lens of the magnifying glass has a focal length of 5.00cm ( part C) Determine the angular magnification of the magnifying glass when the virtual image of the ring is located 165 cm from the lens.
1/f = 1/do + 1/di
M = (1/f - 1/q)N.P.
[(1/5) - (1/165)]40cm = 7.76cm (right answer is 8.24 centimeters ***edit NOT meters. just cm I am just tired and almost done my last exam*** ) and i can't figure out how to get it
 
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nvm, i didnt figure it out.
 
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