Question 5 (4 points) Which is a correct statement regarding microscope use?
You should always begin with the lowest power objective lens.
This highest power objective lens is generally the shortest one.
You should always start with the highest power objective lens.
Once you center under low power, you will not recenter again.

Once you center under low power, you will not recenter again.

Explanation:

The correct option would be that once you center under low power, you will not recenter again.

One can start focusing a slide using the x10 or x40 objectives, it does not have to always be the x10 objective and it is never advisable to start with the highest power objective. Also, the highest power objective lens is the longest and not the shortest one.

However, once the field diaphragm has been centered under low power, one does not need to center again but only to refocus.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%