A student is using a light microscope to study plant cell structures. They want to observe a chloroplast with an actual length of 5.0 μm5.0\ \mu\text{m}5.0 μm so that its image appears to have a length of 3.5 mm under the microscope. If the microscope is fitted with a 14× 14\times\,14× magnification eyepiece lens, which objective lens magnification must be selected to achieve this?
5×5\times5×
50×50\times50×
140×140\times140×
500×500\times500×
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.