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  4. If a thin film of thickness t and refractive index μ is placed in the path of light coming from a source S, then increase in length of optical path is :

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Q. If a thin film of thickness $t$ and refractive index $\mu$ is placed in the path of light coming from a source $S$, then increase in length of optical path is :

Wave Optics

Solution:

Increase in optical path is given as
$\Delta=\mu t-t=(\mu-1) t $