A microscope with a tube length of 160 mm achieves a total magnification of 800X with a 40X objective and a 20X eyepiece. The microscope is focused for viewing with a relaxed eye.
How far is the sample from the objective lens?
Mobjective = -L/fobjective
The Attempt at a Solution
so I found the fobjective to be 0.4cm and the feyepiece to be 1.25
I'm just not sure what to do next. Which objective do I use to find the distance of the sample? or do you combine them somehow?