1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: Fing image

  1. Dec 19, 2007 #1
    1. The problem statement, all variables and given/known data
    An object is kept at a distance d=2.5cm from a Glass sphere of radii R=10 cm .Find the final image of the point object?

    [tex]\mu =1.5[/tex]

    2. Relevant equations

    3. The attempt at a solution
    it is a simple question where we have two interfaces and we have to calculate the image due to 1st surface which acts as object for second and then the final image.
    But i am not getting the answer
    Last edited: Dec 20, 2007
  2. jcsd
  3. Dec 20, 2007 #2


    User Avatar
    Homework Helper

    Show your calculations. What is your answer? What are the values of refractive indices
  4. Dec 20, 2007 #3
    the answer is 15cm in front of mirror
    attempt being
    for the first case object distance is -2.5cm and R.I is 1.5 plugging in the formulae i get
    the image distance is v=-30/7
    so this ats as image for 2nd surface and bject distance being u=-170/7=-30/7-20

    again putiing in the values gives v=-85 cm which is far from the answer i don't get what i did wrong
  5. Dec 20, 2007 #4

    Shooting Star

    User Avatar
    Homework Helper

    The problem, as stated in the first para, presumably talks about a mirror. The attempt at solution talks about interfaces and RIs. Would you formulate the problem clearly?
  6. Dec 20, 2007 #5
    sorry it is a GLass SPhere
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook