Microscopy 4 - Calculations

• calculation for magnification

  image size divided by object size

  
• How would you rearrange the magnification equation to find image size?

  Image size = object size x magnification 
• A plant cell in a photograph measures 40 mm in width. If the real width of the plant cell is actually 0.02 mm, what is the magnification? 

  2000
• The nucleus in a photograph of a cell measures 1.5 mm across. If the magnification in the photograph is × 500, what is the actual size of the nucleus?

  0.003
• Elouise finds a woodlouse that is 8 mm long. When she views it under the microscope it appears 12 cm long. 

  What is the magnification?

  15
• A sperm cell is 5 μm long. How long will it appear when viewed under a microscope with a magnifying power of x1500? 

  (Give your answer in mm)

  7.5mm
• A scientist observed a skin cell using an electron microscope.

  The size of the image was 25 mm, and the magnification was × 100,000.

  Calculate the real size of the cell, giving your answer in nm. 

  250
• A human egg cell is roughly 100 μm wide.

  How large would it appear when viewed under a microscope at x 60 magnification? 

  (Give your answer in cm)

  0.6cm