Thames & Kosmos Kids First: Biology Lab (V 2.0) handleiding

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Thames & Kosmos

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How does a

microscope

magnify objects?

Inside your microscope, there are

curved, clear plastic disks called

optical lenses, which are located in

the eyepiece (ocular lens) and lower

down in the nosepiece (objective

lenses). In principle, these lenses

work in the same way as the two drops

of water from your ﬁrst experiment.

The different lenses enlarge objects

on the stage to different degrees.

The lens in the eyepiece enlarges the

object 15 times. The objective lenses enlarge the object 4 times (red

lens), 10 times (yellow lens) or 40 times (blue lens). To calculate the

total magniﬁcation, you have to multiply these two numbers together.

The lenses are the most important parts of your microscope. Treat them

with care. Dirty or scratched lenses will no longer give you sharp images!

TIPS FOR PROPERLY CARING FOR YOUR MICROSCOPE

Never touch the lenses with your ﬁngers, and be careful not to let the

lenses in the eyepiece or nosepiece bump against other objects. Dirty or

scratched lenses will not produce a sharp, clear image!

If dust has collected on one of the lenses, gently wipe it away with a soft,

dry cloth. Do not use a cleaning solution for cleaning your microscope,

since it might damage some of the components.

Ideally, hold onto the microscope by the stand or the base only.

Ocular lens

Eye

Light source

Actual

intermediate

image plane

Intermediate

lens

Objective lens

Slide

Stage

Diaphragm

Apparent

image plane

The path of light

through a microscope

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