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Question

The bottom of a container is 14.0 cm thick glass (μ=1.5) slab.The container contains two immiscible liquids A and B of depths 6.0 cm and 8.0 cm respectively.What is the apparent position of a scratch on the outer surface of the bottom of the glass slab when viewed through the container ? Refractive indices of A and B are 1.4 and 1.3 respectively.

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Solution

Given: The bottom of a container is 14.0 cm thick glass (μ=1.5) slab.The container contains two immiscible liquids A and B of depths 6.0 cm and 8.0 cm respectively. Refractive indices of A and B are 1.4 and 1.3 respectively.
To find the apparent position of a scratch on the outer surface of the bottom of the glass slab when viewed through the container
Solution:
The total apparent shift of the scratch on the outer surface is obtained by considering refraction at all the three media.
I.e.,
t1(11μ1)+t2(11μ2)+t3(11μ3)
where t1,t2,t3 are the thickness of the glass, liquid A,liquid B respectively.
and μ1,μ2,μ3 are the refractive index of glass, liquid A, liquid B respectively.
=14(111.5)+6(111.4)+8(111.3)=14(0.33)+6(0.28)+8(0.23)=4.62+1.68+1.84=8.14
is the apparent position of a scratch on the outer surface of the bottom of the glass slab when viewed through the container.

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