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Homework Help: Newton colobars (or colorbars)

  1. May 26, 2010 #1
    1. The problem statement, all variables and given/known data

    Well it's problem to translate it but I will try...

    We measured newtons colobars, the radius of third dark colobar in reflective light is r3 (without any data). When we filled the space between lens and board, that radius (r3) had 4th dark colobar... determine the refractive index of liquid!

    colobar = http://i46.tinypic.com/bfkqxf.png"

    2. Relevant equations

    I found this on internet...

    d= sqr(r)/R

    kλ=2d + (λ/2)


    (k + 0.5)λ= 2d + (λ/2)

    3. The attempt at a solution

    i don't have a clue really... I don't even know how to translate it...

    It's not for me, it's for my brother (high school)... He asked me to try to find solution... But it's not in my field (i'm medical college student)... so...

    Last edited by a moderator: Apr 25, 2017
  2. jcsd
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