wunder beta

🔬 Using a Microscope

Learn the parts of a compound microscope and how to bring the tiny world into sharp focus.

lessons

~15 min

to learn

🔬 Science

subject

Teens

level

Start the course →

What you’ll learn

Parts of a MicroscopeIdentify the main parts of a compound light microscope and say what each one does.A compound microscope uses two sets of lenses to magnify a sample lit from below. You look through the eyepiece while the objective lenses do most of the magnifying, the stage holds the slide, and the focus knobs sharpen the image. Knowing each part is the first step to using the microscope well.
Preparing a SlidePrepare a slide and focus a microscope using the correct sequence of steps.A sample must be thin and flat on a glass slide so light can pass through it. To view it, place the slide on the stage, start with the lowest-power objective, use the coarse focus and then the fine focus to sharpen the image, and only then switch to a higher magnification. Turning the knobs gently keeps the lens from cracking the slide.
The Power of MagnificationCalculate total magnification by multiplying the eyepiece magnification by the objective magnification.Magnification is how many times larger an object looks than its real size. A microscope's total magnification is found by multiplying the eyepiece number by the objective number, so a 10× eyepiece and a 40× objective give 400×. Higher magnification shows a smaller area in greater detail.

Questions this course answers

Which part of the microscope do you look through?

The eyepiece is the lens at the top that you look into, usually magnifying ten times.

Which part holds the slide in place?

The stage is the flat platform that the slide rests on while light shines up through it.

Which objective lens should you start with when viewing a slide?

You start with the lowest-power objective because it is easier to find and focus the sample before zooming in.

Which knob do you use last to make the image perfectly sharp?

The fine focus knob makes small, careful adjustments to sharpen the image after the coarse focus gets it roughly clear.

What is the total magnification of a 10× eyepiece and a 40× objective?

You multiply the two lenses together, so 10 × 40 = 400×.

How do you calculate a microscope's total magnification?

Total magnification is found by multiplying the eyepiece magnification by the objective magnification.

Grounded in trusted sources

BBC Bitesize
Britannica
Khan Academy
Britannica Kids

Every Wunder lesson is built from real, reputable sources — never invented.

Related Science courses

🦠Single-Celled Organisms 🔬Cells, Tissues, and Organ Systems 🔑Using Classification Keys 🦎Variation and Survival 🌤️Watching the Weather 🌦️Weather and Climate 🪨Weathering and Erosion 🐬Whales and Dolphins Are Mammals

Wunder is a personalized learn-anything platform — tell it any topic and it builds a beautiful, fact-checked course in minutes, with narration, a knowledge check, and a college-style University track.

Browse more Science courses · All topics · Home