Question
Edexcel 1BI0 Paper 1
A student uses a light microscope to observe an onion cell. The image of the cell is 45 mm long. The actual length of the cell is 150 µm.
(a) Calculate the magnification of the microscope. Show your working and give the correct unit. (2 marks)
(b) The student switches to a higher-power objective lens. The image is now 90 mm long. Calculate the actual length of the cell at this magnification (×600). Give your answer in µm. (1 mark)
3 marks · take your time before peeking.
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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.