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Lens problem

  1. Aug 22, 2012 #1
    Lens problem!!

    Hi guys,
    When an object is placed in front of a convex lens ( not between Focus and optical centre ), the image formed on the other side should be inverted and real. My question is, with the mentioned placement of the object, will the image be laterally inverted? Further more, will a virtual image formed by the same lens be laterally inverted?

    Same question for concave lenses.

    Thanks everyone!
  2. jcsd
  3. Aug 22, 2012 #2

    Simon Bridge

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    Re: Lens problem!!

    Sketch the ray diagrams and see :) Seriously - this is an important exercise that you have to do for yourself to get the benefit.

    Draw an "overhead" diagram for an object that has a distinct left-right about it.

    The external shape of the lens is not sufficient, by itself, to determine it's affect on light. A given "biconvex lens" may not behave as expected - the behavior depends on the refractive index of the lens material and that for the surrounding medium as well as the shape. In your case, a better description would be "converging lens" - since parallel rays converge towards the focus. The opposite is "diverging lens" since parallel light diverges from the opposite focus.
  4. Aug 22, 2012 #3
    Re: Lens problem!!

    Hi man, thx for the reply. I still can't draw the ray diagram u have mentioned.. Mind giving some help? ; (
  5. Aug 22, 2012 #4

    Simon Bridge

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    Re: Lens problem!!

    Can you draw the regular one?

    Imagine, the z axis going along the optic axis of the diagram.
    The regular arrow you use for the diagram points along the y-axis ... and you look at the setup along the x axis to get the usual setup.

    Just imagine there is another arrow along the x-axis and draw what it looks like looking down the y-axis. Then draw in principal rays for this setup.

    (If you are really good you can draw it in 3D.)
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