GCSE · Biology · AQA · Spec 8461

Microscopy: light vs electron

Light vs Electron Microscopy

Light MicroscopevsElectron Microscope

Focus on magnification and resolving power — these are the two key properties to compare.

Focus

Magnification

Light Microscope

Lower magnification

Electron Microscope

Higher magnification

The insight

Electron microscopes can make objects appear far larger, but magnification alone does not determine how much detail is visible — resolution is the additional factor.

Resolving power (resolution)

Light Microscope

Lower resolution — two very close-together points may not be distinguished as separate

Electron Microscope

Higher resolution — two very close-together points can be distinguished as separate

Level of sub-cellular detail

Light Microscope

Less detail — limited by lower magnification and lower resolution

Electron Microscope

Greater detail — both higher magnification and higher resolution contribute

Development over time

Light Microscope

Microscopy techniques have developed over time

Electron Microscope

Electron microscopy represents a development that increased both magnification and resolving power

Stop and think

Read carefully — these two terms are easy to mix up.

A scientist increases the magnification of their microscope from ×500 to ×2000, but the resolving power stays the same. What happens to the image of two very close-together points?

Using the magnification equation — step by step

Follow these steps every time — unit mismatches are the most common error.

Relationship matrix

Tap any cell to reveal it. Tap a column header to read one property down every item.

MagnificationResolving power (resolution)Detail of sub-cellular structures
Light microscope
Electron microscope

Each cell hides a short answer and the reason behind it. Predict before you tap.

LIGHTBULB PRACTICE

Practice questions

Does your answer hit all the marking points?

Question

Explain why the development of electron microscopes has increased our understanding of sub-cellular structures compared with light microscopes. [4 marks]

Student answer

Electron microscopes have a higher magnification than light microscopes. They also have a higher resolving power. This means they can distinguish two points that are very close together as separate points. As a result, sub-cellular structures can be seen in far greater detail.

Method marks0/4

WHAT YOU'VE LEARNED

A quick recap of today's lesson.

Magnification, resolution, and the maths behind measuring cells

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How this lesson was checked. This AQA GCSE Biology (specification 8461)lesson was published through Lightbulb Learning's human-designed editorial process — the educational standards, accuracy rules and publication checks it must pass were authored and approved by Philip Halpin. It passed subject-specific assessment, automated educational checks and technical publication verification before going live (publication checks completed 11 August 2026). Published pages are monitored, human spot-checking is ongoing across the lesson library, and anything found wrong is corrected or withdrawn. How our lessons are made and checked. Spotted a mistake? Email hello@lightbulblearning.co and we'll review it.