Microscope Basics

“You are viewing a specimen at 4x magnification and the image is clear. Describe the next steps you would take to view the specimen at 10x magnification. You have switched to the 40x objective lens, but the image is blurry. What two adjustments could you make to try and focus the image? After switching to a higher power objective lens, the specimen is no longer in the center of your view. What should you do to re-center it?”