How can you tell the size and shape of a cell?
The size of a cell can be measured under the microscope by micrometery and its shape is also observed by microscopes.
A scientist would use a light microscope to determine the size and shape of a cell. A light microscope uses visible light to illuminate the object being viewed. Light microscopy is used to observe the overall size and shape of a cell. An electron microscope is used to observe the structure and contents of a cell, including membrane-bound organelles.