When first focusing a microscope on a specimen, which objective lens should always be used first?
A)Low-power
B)Scanning
C)Oil immersion
D)High-power
E)It does not matter; any objective lens can be used first.

Question

Quizplus · Accepted Answer

The scanning objective lens (usually the lowest magnification lens) is used first when focusing on a specimen with a microscope. This is because it has the longest working distance, reducing the risk of damaging the slide or lens, and it makes it easier to locate and center the specimen before switching to higher magnifications.

When First Focusing a Microscope on a Specimen, Which Objective