Shadowing Practice: Parts of a Microscope & How to Use a Microscope - Learn English Speaking with Video
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in this video we're going to learn about microscopy which just means the use of microscopes
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so we'll cover what a microscope is what the terms object image and magnification mean
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the different parts of a light microscope and finally how to use a light microscope To start off,
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we need to know what a microscope is.
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So a microscope is a tool that we use in science to make things look much larger than they actually are, and so help us see tiny details.
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For example, we often use microscopes in biology to look at cells, which we can't see with the naked eye, but can see with a microscope.
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before we go any further we need to introduce the terms object
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and image in microscopy the term object refers to the real object
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or the sample that you're looking at so
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if we had some onion cells on our microscope slide then these cells themselves would be the object
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the term image on the other hand refers to the image that we see when we look down the microscope
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for example if we were to look down this microscope we might see something like this
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so this would be our image whereas the object is the actual onion cells on the microscope slide
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that we're looking at this brings us nicely to the next term you need to know magnification
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which we can define as how many times larger the image is than the object
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So if the image appeared 1 ,000 times larger than the object, then the magnification would be times 1 ,000.
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Next, let's move on to look at the different parts of a light microscope.
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Supporting the whole thing is the base at the bottom, and then the arm that connects the bottom to the top.
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Then we have some kind of light source, which on some microscopes would be a lamp, But in this case, it's just a mirror reflecting the light from the room.
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And just above it is the stage, which is where we put our microscope slide.
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Then in the top half, we have all of our lenses.
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So we normally have three objective lenses, which we can choose between, and each have different magnifications.
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And then also an eyepiece lens, which has a fixed magnification.
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And sits just below where we look into the microscope.
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Then the last things to notice are the body tube here
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and the coarse and fine focusing knobs which we can turn to help us get the image in focus.
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The last thing we need to cover are the main steps of how to use a light microscope.
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First, we need to set up the microscope near a window
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or a lamp to make sure there's enough light and angle the mirror to direct the light upwards.
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This will reflect the light up through the hole in the stage.
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We then need to take our specimen
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which is the scientific word for whatever it is you'll be looking at
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and place it on a thin glass plate called a slide.
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Next we take our slide with the specimen on, place it onto the stage and secure it.
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This means we put it just here so the light reflected shines through the specimen and up through the microscope.
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Now that our slide is in place, we can look through the eyepiece lens and adjust the focus.
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So first we turn the coarse focus knob to get a rough image
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and then we can turn the fine focus knob to fine
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-tune it until we have a clear magnified view of our
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specimen finally this part here where the objective lenses are can
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rotate to switch to an objective lens with a higher magnification
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then you can adjust the focus again to bring the specimen back into clear view
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if you haven't heard yet you can find all of our videos on our website cognito .org You'll also find questions,
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flashcards, exam -style questions, and past papers.
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And we track all of your progress so that you always know what to study next.
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So sign up for free by clicking here or browse our playlist here on YouTube.
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Woordenschat en spreektips bij deze les
Deze video bevat 46 zinnen en 698 woorden om na te spreken. Het gesproken deel duurt 4:40. De spreker praat in een gelijkmatig tempo van ongeveer 149 woorden per minuut, prettig om te shadowen. 84% van de woorden hoort bij de 3.000 meest gebruikte Engelse woorden; de rest kun je beter vooraf bekijken.
Belangrijke woorden in deze video
15 woorden uit de video die het leren waard zijn, met uitspraak en betekenis:
| Woord | Uitspraak | Betekenis |
|---|---|---|
| microscope zelfstandig naamwoord | /ˈmaɪ.kɹəˌskoʊp/ | microscoop |
| slide zelfstandig naamwoord | /ˈslaɪ̯d/ | glijbaan, schuifaf |
| lens zelfstandig naamwoord | /lɛnz/ | lens |
| specimen zelfstandig naamwoord | /ˈspɛsɪmɪn/ | voorbeeld |
| reflect werkwoord | /ɹɪˈflɛkt/ | weerkaatsen |
| objective zelfstandig naamwoord | /ɒbˈd͡ʒɛk.tɪv/ | object |
| mirror zelfstandig naamwoord | /ˈmiɹɚ/ | spiegel |
| refer werkwoord | /ɹɪˈfɜː/ | verwijzen, doorverwijzen |
| adjust werkwoord | /əˈd͡ʒʌst/ | aanpassen, verstellen |
| lamp zelfstandig naamwoord | /ˈlæ̝mp/ | lamp |
| onion zelfstandig naamwoord | /ˈʌn.jən/ | ui, ajuin |
| thin bijvoeglijk naamwoord | /ˈθɪn/ | dun |
| naked bijvoeglijk naamwoord | /ˈneɪkɪd/ | naakt, bloot |
| whereas | /(h)wɛɹˈæz/ | hoewel, terwijl |
| angle zelfstandig naamwoord | /ˈæŋ.ɡəl/ | hoek |
Phrasal verbs die je zult horen
| Woord | Uitspraak | Betekenis |
|---|---|---|
| set up werkwoord | /ˌsɛt ˈʌp/ | bereiden, voorbereiden |
Grammatica in deze video
De structuren die de spreker het meest gebruikt, met de exacte woorden uit de video:
| Structuur | In de video |
|---|---|
| Betrekkelijke bijzinnen who / which + zin — extra informatie over een persoon of ding | stage, which is · lens, which has |
| Vergrotende trap -er than / more … than — twee dingen vergelijken | larger than |
| Verplichting: must / have to / need to zeggen dat iets nodig is | need to know · need to introduce · need to cover |
| Toekomst met “will” will + werkwoord — een besluit, belofte of voorspelling | we'll cover · will reflect · you'll be |
Uitspraak om op te letten
De spreker gebruikt 8 samentrekkingen en verkorte vormen, zoals we're, you'll, can't. Spreek ze kort uit, zoals je ze hoort.
- De klanken “sh” en “zh”: examination /ɪɡˌzæm.ɪˈneɪ.ʃən/, shine /ʃaɪn/, magnification /ˌmæɡnɪfɪˈkeɪʃən/, flashcard /ˈflæʃˌkɑɹd/
- Lange woorden — let op de klemtoon: examination /ɪɡˌzæm.ɪˈneɪ.ʃən/, biology /baɪˈɑ.lə.d͡ʒi/, magnification /ˌmæɡnɪfɪˈkeɪʃən/, microscopy /maɪˈkɹɑ.skə.pi/
Zo oefen je met deze video
- Luister de hele video één keer zonder te spreken en noteer de woorden die je niet kent.
- Spreek zin voor zin na op normale snelheid en herhaal elke zin tot je ritme gelijk is aan dat van de spreker.
- Neem jezelf op en vergelijk met het origineel; let daarbij op woorden als microscope, slide, lens.
Wat is de Shadowing-techniek?
Shadowing is een wetenschappelijk onderbouwde taalleermethode die oorspronkelijk is ontwikkeld voor professionele tolkentraining en gepopulariseerd door polyglot Dr. Alexander Arguelles. De methode is eenvoudig maar krachtig: je luistert naar native Engelse audio en herhaalt het onmiddellijk hardop — als een schaduw die de spreker volgt met slechts 1–2 seconden vertraging. In tegenstelling tot passief luisteren of grammaticadrills, dwingt shadowing je hersenen en mondspieren om echte spraakpatronen tegelijkertijd te verwerken en te reproduceren. Onderzoek toont aan dat het de uitspraaknauwkeurigheid, intonatie, ritme, verbonden spraak, luisterbegrip en spreekvaardigheid aanzienlijk verbetert — waardoor het een van de meest effectieve methoden is voor IELTS Speaking-voorbereiding en echte Engelse communicatie.