An immunologist is using a light microscope to examine a sample of human neutrophils (a type of white blood cell).
The microscope is configured with a ×12.5 \times 12.5\,×12.5 eyepiece lens and a ×60 \times 60\,×60 objective lens. Determine the total magnification of the neutrophil sample.
A spherical secretory vesicle inside one of the neutrophils has an actual diameter of 0.85 μm0.85\text{ }\mu\text{m}0.85 μm. Using the total magnification calculated in part (a), calculate the diameter of the vesicle's image as it appears under the microscope, in micrometres (μm\mu\text{m}μm).
40 exam-style questions on OCR GCSE Biology 1.1 Cell structures, covering 1.1.1 Viewing cells with light microscopes, 1.1.2 Sub-cellular structures and functions, and 1.1.3 Electron microscopy and resolution. Each one has a worked solution and a mark scheme showing where the marks go.