Objective lenses

Definition

Objective lenses are the primary optical lenses on a microscope that magnify the specimen. They are typically located closest to the specimen being observed.

5 Must Know Facts For Your Next Test

1. Objective lenses come in different magnifications, commonly ranging from 4x to 100x.
2. The total magnification of a microscope is calculated by multiplying the ocular lens magnification with the objective lens magnification.
3. High-power objective lenses, such as the 100x oil immersion lens, require a drop of immersion oil between the lens and the slide for clear viewing.
4. Objective lenses are usually mounted on a rotating nosepiece to allow easy switching between different magnifications.
5. The quality of objective lenses can greatly affect image resolution and clarity, making them critical components in microscopy.

Review Questions

Related terms

Ocular Lens:

The eyepiece through which a person looks into a microscope, usually providing additional magnification.

Resolution:

The ability of a microscope to distinguish two close objects as separate entities.

Stage:

The platform on which slides holding specimens are placed for observation under a microscope.