How to Use a Microscope

This set of vocabulary flashcards covers the essential parts, handling procedures, focusing techniques, and magnification calculations for using a light microscope based on the lecture notes.

Ocular lens

The eyepiece of the microscope which provides $10 \times$ magnification.

Objective lenses

Lenses that provide varying levels of magnification, typically $4 \times$, $10 \times$, and $40 \times$.

Stage

The component located below the objective lenses where the slide is placed.

Course and fine focus

Knobs located on the sides of the microscope used to adjust the clarity of the image.

Microscope Handling

A protocol requiring the use of two hands: one hand on the base and one hand on the arm.

Initial Focusing Step

The process of choosing the $4 \times$ objective lens or the lens with the lowest magnification before placing the slide.

High-Power Focusing Rule

When using the $10 \times$ and $40 \times$ objectives, only the fine focus should be adjusted; the course focus must never be used.

Total magnification

A value telling you how magnified an image is compared to its actual size, calculated using the formula: $(\text{ocular lens}) \times (\text{objective lens}) = \text{total magnification}$.

$40 \times$ Total Magnification Example

The result of multiplying a $10 \times$ ocular lens by a $4 \times$ objective lens ($10 \times 4 = 40 \times$).

Brightness adjustment

A control located on the side of the microscope base.