Question

question 15
1 point
which objective would you use if the distance between it and the slide being observed is the least?
high power
low power
oil immersion
scanning
question 16
1 point
which of the following procedures should you perform before using the microscope?
clean all lenses with lens paper.
plug the microscope into an outlet and turn the light on.
the objective should be turned to scanning power.
all of the above

Explanation:

For Question 15: Microscope objective lenses have shorter working distances with higher magnification. Oil immersion lenses are the highest magnification option here, so they have the least distance to the slide.
For Question 16: Preparing a microscope includes cleaning lenses to remove debris, powering on the light source for visibility, and starting at the lowest magnification (scanning power) to easily locate specimens. All these steps are standard pre-use procedures.

Answer:

Question 15: Oil immersion
Question 16: All of the above