Microscope Master
Light vs electron microscopes, resolving power, and the magnification maths — including the unit conversion that trips everyone up.
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Microscope Master 🔬
Cells are far too small to see with the naked eye — so we magnify them. But magnifying is only half the story, and the maths behind it wins (or loses) real marks. By the end you'll pick the right microscope, explain resolving power, and calculate magnification — units and all.
Two kinds of microscope ⚡
There are two types you must compare: • **Light** (optical) microscope — cheaper, portable, and can view **living** cells, but has **lower** magnification and resolving power. • **Electron** microscope — **much higher** magnification and resolving power, revealing tiny sub-cellular structures. But it is expensive, large, and the sample must be **dead** (viewed in a vacuum).
Sort the ideas
- Light microscope
- Electron microscope
- Magnification
- Resolving power
- Lower magnification, but can view living cells
- Very high magnification and resolution
- How many times larger the image is
- The ability to tell two close points apart
Which microscope?
A scientist needs to see the detailed internal structure of a ribosome. Which microscope should they use, and why?
- Electron — it has much higher resolving power
- Light — it can view living samples
- Either — they show the same detail
- Neither can show a ribosome
The magnification triangle 🔺
One formula ties it together: **image size = magnification × real size** Rearrange it with the triangle (image on top, magnification and real size below): • magnification = image size ÷ real size • real size = image size ÷ magnification Golden rule: **make both sizes the same unit before you calculate.**
Work out the magnification
An interactive activity.
Units and standard form 📏
Cells are measured in tiny units — convert before you calculate: • **1 mm = 1000 µm** (micrometres) • **1 µm = 1000 nm** (nanometres) Very small sizes are often written in **standard form** — e.g. `0.002 mm = 2 × 10⁻³ mm = 2 µm`. The classic dropped mark is forgetting the **mm → µm** conversion.
Now with a conversion
An interactive activity.
Say the method
To find magnification, divide the _____ size by the _____ size — but first convert both to the same _____.
Know your units
How many micrometres (µm) are there in 1 millimetre (mm)?
- 1000
- 100
- 1 000 000
- 10
In the exam 🎓
Mastered. Grade-9 habits for microscopy: • **Electron** microscopes beat light ones on **magnification and resolving power**; light ones can view **living** cells. • **Resolving power** = telling two close points apart — the reason electron microscopes show more detail. • For the maths: **image = magnification × real size**, and **match the units first** (the mm → µm slip is the usual lost mark).