Thames & Kosmos Kids First: Biology Lab handleiding

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Thames & Kosmos

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Handleiding

4. Rotate the nosepiece so that the objective

lens with the lowest magnification (96x –

144x) is above the slide. Use the fine

adjustment knob to lower the objective lens

all the way down and then gradually up

again until the image is sharp.

5. Keep rotating the nosepiece to the next two

magnification levels, using the fine

adjustment knob to sharpen the image each

time.

6. Everything OK so far? Now for the final trick:

Turn the silver sleeve around the eyepiece to

enlarge the microscope image even more!

EXPLANATION

When you look through the eyepiece, you

will first just see a blurry image, or

maybe nothing at all.

If you just see a blurry image, it is

because the two lenses (in the eyepiece

and the nosepiece) are not yet at the

optimum distance from each other. To

get a clear enlarged image, the

distance between the lenses (just as

with the “two-drop microscope” in

the first experiment) will have to be

adjusted. To do this, slowly (!) turn

the fine adjustment knob while

looking through the eyepiece, and

you will get a clear image.

If you don’t see anything at all, it’s

probably because the specimen is

not positioned precisely beneath

the objective lens. Carefully move

the slide on the stage in order to

bring the specimen into the

correct position.

TIP!

Always start with the

lowest magnification in

order to get an overview

of the object on the slide.

TIP!

Before turning the

microscope upside-

down, it’s best to remove

the eyepiece and set it

aside so that it doesn’t

accidentally fall out and

get damaged.

TIP!

Use the adjustment wheel

on the underside of the

stage to select different de-

grees of illumination and

different color filters,

which will help you get the

sharpest image of the ob-

ject you are looking at. Ex-

periment a little!

Microscopy Basics

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