1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Problem doing glass slab refraction based questions

  1. Dec 4, 2013 #1
    1. The problem statement, all variables and given/known data

    I understand the basic formula per say of the apparent shift due to glass slab (t(1-1/u)) But when a question comes on i just don't know how to proceed. For ex this question came on my test and i just couldn't visualise how to make ray diagram or even attempt it.

    2. Relevant equations
    '"There is a dust particle on a a glass slab of thickness t and refractive index 3/2 . When seen from one side if the slab, the dust particle appears at a distance 6 cm. From the other side it appears at 4cm. Find the thickness t of the glass slab"

    3. The attempt at a solution

  2. jcsd
  3. Dec 4, 2013 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    ... I think you mean that the dust particle is inside the glass slab.

    The particle is closer to one side than the other.

    sketch the slab side on - put a dot in it closer to one side than the other.
    draw a line perpendicular to the sides of the slab that goes through the dot.
    Where the line intersects the sides of the slab is points A and B.
    The dot is point P.

    All these are real, rather than apparent, positions.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted