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: Newton's Rings and plano-convez lens

  1. May 3, 2007 #1
    1. The problem statement, all variables and given/known data
    A plano-convez lens (flat on one side, convez on the other) rests with its curved side on a flat glass surface. The lens is illuminated from above by light of wavelength 521 nm. A dark spot is observed at the centre, surrounded by 15 concentric dark rings (with bright rings in between). How much thicker is the air wedge at the position of the 16th dark ring than at the centre?

    2. Relevant equations
    There were no equations introduced in this section.

    3. The attempt at a solution
    The answer says 3.90 X 10^-7m. By multiplying the wavelength by 15 and then dividing it by 2, i get this answer.. by why? Is there actually an equation for these type of problems?
  2. jcsd
  3. May 4, 2007 #2


    User Avatar
    Gold Member

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook