Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Lens problems

  1. Apr 21, 2004 #1
    1) Aconverging lens with a focal length of 7 cm forms an image of a 4 mm tall real object that is to the left of the lens. The image 1.10 cm tall and erect.
    Where is the object located?
    Where is the image located?
    2) A converging lens with a focal length of 12 cm forms a virtual image 5 mm tall, 19 cm to the right of the lens.
    Determine the position of the object. (Give the object distance with the correct sign).
    Determine the size of the object.
  2. jcsd
  3. Apr 21, 2004 #2

    Doc Al

    User Avatar

    Staff: Mentor

    You'll need the lens equation: 1/f = 1/o + 1/i, and the definition of linear magnification: m = -i/o.

    Look up how these equations are used and give the problems a try.
  4. May 8, 2004 #3
    There is a good simulation program picture what about it
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook