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Convex lens

  1. Aug 15, 2005 #1
    A convex lens is placed on a flat glass plate and illuminated from above with monochromatic red light. When viewed from above, concentric bans of red and dark are observed. What does one observe at the exact center of the lens where the lens and the glass plate are in direct contact.
     
  2. jcsd
  3. Aug 15, 2005 #2

    Doc Al

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    Staff: Mentor

    There is a thin layer of air between the surfaces, thus light reflects at the glass/air boundaries. The first reflection is at the lens/air boundary, the second at the air/plate boundary. Consider the interference between these two reflections. (What is their phase difference?)
     
  4. Aug 17, 2005 #3
    bump
    Still can't figure out :mad:
     
  5. Aug 17, 2005 #4

    Doc Al

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    Staff: Mentor

    What have you done so far? What can you say about the two reflections?
     
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