Calculating Magnification of a Microscope: Solving the Magnification Problem

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To calculate the magnification of a microscope, the user initially attempted to apply the lens formula but found it unhelpful. They then shifted to using the magnification formula M = hi ÷ ho = -di ÷ do. The object height is 4.00 x 10^-7 m, and the image height is 1.00 x 10^-4 m, leading to a magnification calculation of M = (1.00 x 10^-4) ÷ (4.00 x 10^-7), which simplifies to 250. The user is seeking guidance to confirm their calculations and complete multiple similar problems.
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A microscope produces an image that is 1.00 x 10-4 m high from an object that is 4.00 x 10-7m high. What is the magnification of the microscope?



I've already tried applying this with the formula 1f = 1÷do + 1÷di

So: 1f = ( 1÷ 4.00 x 10-7) + ( 1÷ 1.00 x 10-4 )
1f = 250 000 + 1000
1f ÷ 1 = 251 000 ÷ 1
f = 251 000

Already, this doesn't seem to be the right answer in my opinion.. but I'm not sure. Now, I'm trying to use the formula M = hi ÷ ho = -di ÷ do

Can anyone help sort of.. guide me in the right direction on how I'm supposed to solve this now? (= ~Thanks
 
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Three hours of no replies.. I'm sorry for being impatient but I have around 20 of these questions to solve for tomorrow.. so yeah ._. Help please?
 

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