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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

    t(1-1/3/2)
     
  2. jcsd
  3. Dec 4, 2013 #2

    Simon Bridge

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    ... 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.
    t=|AB|
     
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