Ray optics

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Question

The length of the optical path of two media in contact of length $d_{1} and d_{2}$ of refractive indices $μ_{1} and μ_{2}$ respectively, is

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Solution

Optical path = $μt$
In medium (1), optical path= $μ_{1} d_{1}$
In medium (2), optical path= $μ_{2} d_{2}$
$∴$ Total path = $μ_{1} d_{1}$ + $μ_{2} d_{2}$

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