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agenttiny200
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Homework Statement
The distance between the objective and eyepiece lenses in a microscope is 21cm . The objective lens has a focal length of 5.5mm. What eyepiece focal length will give the microscope an overall angular magnification of 350?
Homework Equations
M=(25*d)/(fe*fo) or
M=(25*d)/(fe*fo)+25?
where d=5.5cm, M=350, f0=21cm, and fe is unknown
The Attempt at a Solution
The online program says the answer is 2.4cm using the second equation, so I'm wondering why I don't use the first equation that doesn't add +25, and where the +25 came from? It's really bugging me. (I do not mean the first 25 which is being multiplied by d).