🔬 Magnification Core — Exam Simulator
15 Questions · Formula, Calculation & Unit Mastery · Cambridge IGCSE Biology 0610
Golden Triangle — Magnification
Cover the value you want to find — the remaining two show the operation
State the formula used to calculate magnification.
💡 Hint: Think: what do you already know (image size) vs what you want to find (magnification)?
Rearrange the magnification formula to calculate Actual size.
💡 Hint: If M = I ÷ A, then A = ?
Rearrange the magnification formula to calculate Image size.
💡 Hint: If M = I ÷ A, then I = ?
In an experiment, a cell is drawn 45 mm wide on paper. The actual cell measures 0.015 mm. Identify which values represent 'Image size' and 'Actual size' in the magnification formula.
💡 Hint: Which one is the drawing and which one is the real cell?
A student calculates magnification as 50 mm ÷ 5 mm. State the unit of magnification and explain why.
💡 Hint: What happens to units when you divide mm by mm?
An image of a seed is 50 mm long. The actual seed is 5 mm long. Calculate the magnification.
💡 Hint: M = Image size ÷ Actual size
A photograph of a leaf cell shows the cell to be 36 mm long. The actual length of the cell is 0.09 mm. Calculate the magnification of the photograph.
💡 Hint: M = Image ÷ Actual — be careful with the decimal!
A diagram of a red blood cell is 14 mm in diameter. The actual diameter of a red blood cell is 0.007 mm. Calculate the magnification.
💡 Hint: Convert your working to avoid decimal errors: multiply both by 1000
Under a microscope, a student draws a plant cell 60 mm wide. Using a stage micrometer, the actual width is measured as 0.15 mm. Calculate the magnification used.
💡 Hint: Set up the formula first, then calculate carefully.
A scanning electron micrograph shows a mitochondrion 24 mm long. The actual length of the mitochondrion is 0.002 mm. Calculate the magnification of the micrograph.
💡 Hint: ×2000? ×12000? Set the equation up carefully before pressing calculate.
A diagram of a cell is 80 mm wide. The magnification is ×400. Calculate the actual width of the cell in mm.
💡 Hint: A = I ÷ M
A diagram of a nucleus is 15 mm in diameter. The magnification is ×3000. Calculate the actual diameter of the nucleus in mm.
💡 Hint: A = I ÷ M — the answer will be a very small decimal.
An electron micrograph shows a chloroplast 45 mm long at a magnification of ×9000. Calculate the actual length of the chloroplast in mm.
💡 Hint: A = 45 ÷ 9000
A drawing of an Amoeba measures 120 mm across. The magnification label states ×600. Calculate the actual diameter of the Amoeba in mm.
💡 Hint: A = Image ÷ Magnification
A student views a cell under a microscope. The eyepiece lens is ×10 and the objective lens is ×40. The student draws the cell 72 mm wide. (a) Calculate the total magnification used. (b) Calculate the actual width of the cell in mm. Show your working.
💡 Hint: (a) Total magnification = eyepiece × objective. (b) A = I ÷ M
📋 Quick Reference — Magnification Rules
Sign In to Keep Going
You've reached the end of the free preview. Sign in — and upgrade to Plus or Pro — to keep going with Biology.
Full Access
Unlock all 194 lessons