Dissemination of IT for the Promotion of Materials ScienceDoITPoMS Teaching and Learning Packages

Optical Microscopy and Specimen Preparation

Answer to Q4

 
  1. When the aperture stop is made smaller, which of the following occur?
    Yes   a The depth of field increases.
    Yes   b The resolution decreases.
    Yes   c The contrast increases.

    (The contrast may increase slightly, but if the aperture stop is closed too far, diffraction fringes may be produced, giving rise to misleading pictures.)
      No d The brightness increases.

    (The brightness is reduced as the aperture stop is made smaller as this restricts the amount of light reaching the specimen.)
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