Hey, I have questions which I would like you guys to help out with. =(

Question: What does it mean when a microscope is parfocal?
I answered: It means that even when magnifcation of the lenses is changed, the amount of focus remains the same or small changes which could be considered insignificant

Question: Which objective lens focuses closest to the slide?
I answered: 100x objective lens which focus an ocular which magnify it 10x, giving a total of 1000x. (But i am not sure whether i should include immersion oil)

What do you guys think about it? =)