Explain5 marksChallenge
A student prepared a temporary mount of onion epidermal cells and observed them using a light microscope. The student took a photomicrograph on which a scale bar was added. On the print, the scale bar measures 40 mm in length and represents an actual length of 20 μm. One of the cells in the photomicrograph measures 80 mm in length on the print.
(a) Explain how the student could use the scale bar to determine the actual length of this cell.
(b) Explain the difference between resolution and magnification, and state why an electron microscope can reveal more detail than a light microscope.