The slits in a double-slit interference experiment are illuminate… - Vidyadip

Question

The slits in a double-slit interference experiment are illuminated by orange light $(\lambda = 600\ nm)$. A thin transparent plastic of thickness $t$ is placed in front of one of the slits. The number of fringes $(N)$ shifting on screen is plotted versus the refractive index $μ$ of the plastic in graph shown. The value of $t$ is

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Answer

Shift of central maxima $ = n\lambda = \left( {\mu - 1} \right)t$

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