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Homework Help: Real Object, Images formed by a single converging or diverging lens

  1. Mar 31, 2010 #1
    1. The problem statement, all variables and given/known data
    Starting with a real object, which of the following statements are TRUE about the image formed by a single lens? (Choose ALL correct answers, e.g. B, AC, CDF.)

    A) For a converging lens an object has to be placed between the focal length and the lens in order to form a virtual image.
    B) A diverging lens can produce a real, inverted, reduced image.
    C) A converging lens can produce a virtual, upright, enlarged image.
    D) A converging lens cannot produce a real, inverted reduced image.
    E) A converging lens can never produce a virtual, upright, reduced image.
    F) A diverging lens always produces a virtual, upright, reduced image.


    2. Relevant equations
    laws of rays passing through a lens


    3. The attempt at a solution
    I keep getting this wrong, and I'm not sure which one I've mixed up.
    A) True - I believe this is the only way to get a virtual image for a converging lens
    B) False - Diverging lenses CANT produce real images
    C) True - if the object is between the focal point and the lens
    D) False - this is possible if the object is placed, say, 2 times the focal length away from the lens
    E) True - this is not possible because any virtual images are enlarged ???
    F) False - diverging lenses can produce inverted images as well

    can someone help me figure out where I'm wrong?
    These are the answers I've tried:
    TFTFTF
    TTTFTF
    TFTFTT
    TFTFFF
     
  2. jcsd
  3. Mar 31, 2010 #2
    I believe the last one is true. It seems like any raytrace on a diverging lens forms a upright reduced and virtual image.
     
  4. Mar 31, 2010 #3
    I guess my prof said that a diverging lens could possibly form an inverted image, although I'm not sure how.

    I also already tried that combination: TFTFTT
    So I must either have another one wrong or something.... not sure...
     
  5. Mar 31, 2010 #4
    I find that hard to believe as all virtual images are upright.
     
  6. Mar 31, 2010 #5
    I didn't know that all virtual images are upright, that is good to know!

    However, if Part F is true, I still have something else wrong, as I tried: TFTFTT

    So I'm not sure what other one I have wrong...
     
  7. Mar 31, 2010 #6
    Yeah I'm not sure what else could be different TFTFTT seems right to me.
     
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