Magnification and Resolution | A Level Biology | OCR, AQA, Edexcel

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This week we are revising Magnification and Resolution

A-Level Biology can be tough but fortunately we’ve made this tutorial to help you score the A* you need for questions on everything to do with Magnification and Resolution .

Magnification involves making something bigger. In microscopy, magnification is the ability to make the image of a specimen larger than a specimen actually is.

Special glass lenses magnify the image. Microscopes use specialised glass lenses which alter the light passing through a specimen in order to magnify its image. The image can be viewed by the observer or can be projected on a screen.

To calculate magnification, you must know the size of the image and the size of the real object.

Resolution of an image is a measure of detail. Resolution is a numerical measure of how detailed and clear an image is.
Resolution of a microscope is its ability to distinguish two close points. Resolution is a measure of the microscope’s ability to distinguish between two points which are close together on an object. If a microscope can clearly distinguish between the two points, it has a good or high resolution.

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In the last example, you calculated the magnification with 20 rather than 20, 000. Magnification should be 4000 rather than 4.