The objective of a microscope has a focal length
of 0.80 cm and the eyepiece has a focal length
of 4.0 cm. An object is placed 1.50 cm from the
objective. The final image is formed at the near
point of the eye (25 cm).
a) Calculate the distance of the image from the objective.
b) Calculate the distance from the eyepiece lens of the image in part a.
c) Calculate the angular magnification of the microscope.

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c) both a and b.

if they have a finite resultant

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =