Question

when an image is not in focus under high power when you clearly saw the image under low power, what should you never do first?

clean the high - power objective with lens paper

go back to low power to make sure the image is centered and clear

refocus using the fine adjustment and readjust lighting.

call the instructor for assistance.

Explanation:

When switching from low to high power on a microscope, standard troubleshooting steps first involve verifying the image is centered/clear on low power, using fine focus and adjusting lighting, or checking the lens if needed. Calling for instructor assistance should not be the first action, as basic troubleshooting steps are designed to resolve this common issue independently.

Answer:

Call the instructor for assistance.