GCSE Biology – Magnification calculations

Last updated: 21/05/2021

Learning Objectives

-I can calculate magnification

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  1. Current
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  1. What is the formula for magnification?

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  2. What is the formula for size of image?

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  3. What is the formula for size of real object?

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  4. How big is one nanometre?

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  5. What is the overall order of the SI length units?

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  6. Which of these is the largest unit of length?

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  7. Which of these is the smallest unit of length?

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  8. Which of these is the smallest unit of length?

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  9. Which of these is the smallest unit of length?

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  10. What magnification would make an image 48 μm wide from an object 6 nm wide?

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  11. What magnification would make an image 4 cm wide from a 2 μm object?

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  12. If a cell is 20 μm wide and the image is 400 μm wide, what is the magnification?

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  13. If a cell is 32 μm wide and the image is 4800 μm, what is the magnification?

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  14. An image of a cell has a diameter of 8 mm and the actual cell has a diameter of 20 μm. What is the magnification?

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  15. If an object is 1 mm wide and the object is 2 cm wide, what is the magnification?

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  16. A sperm cell has a tail 40 μm long and a student draws it 40 mm long. Calculate the magnification.

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  17. An image is 4 cm wide at 400x magnification. How wide was the object?

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  18. An image is 50 mm wide when viewed under 25x magnification. How big is the object?

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  19. A specimen is 0.3 mm long and is viewed under 40x magnification. What size will the image be?

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  20. A cell is magnified 4,000x and the image is 50 cm long. What is the actual length of the cell?

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  21. If magnification is 400x and the object is 2 nm wide, how wide is the image?

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  22. If magnification is 250x and the object is 12 μm wide, how wide is the image?

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  23. If magnification is 20x and the object is 2 mm wide, how wide is the image?

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  24. A student measures an image of a human capillary to be 5 mm wide. If the magnification is 1000x, how many micrometers wide is the capillary?

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  25. What magnification would make an image 42 nm wide from a 2 nm wide object?

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