Question
Find the thickness of a plate which will produce a change in optical path equal to half the wavelength $\lambda$ of the light passing through it normally. The refractive index of the plate is $\mu$.
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Answer
Let, t = thickness of the plate Given, optical path difference $=(\mu-1)\text{t}=\frac{\lambda}{2}$$\Rightarrow\text{t}=\frac{\lambda}{2(\mu-1)}$
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