Question 317: Waves Optics

Question

On replacing a thin film of mica of thickness $$12 	imes 10^{-5} \mathrm{~cm}$$ in the path of one of the interfering beams in Young's double slit experiment using monochromatic light, the fringe pattern shifts through a distance equal to the width of bright fringe. If $$\lambda=6 	imes 10^{-5} \mathrm{~cm}$$, the refractive index of mica is

Accepted Answer

The equation for the shift in the fringe pattern is given as,
$$\mathrm{n} \lambda=(\mu-1) \mathrm{t}$$
$$	herefore \quad$$ Refractive index of mica is:
$$\begin{aligned}
& \mu=\frac{\mathrm{n} \lambda}{\mathrm{t}}+1 \
	herefore \quad \mu & =\frac{1 	imes 6 	imes 10^{-5}}{12 	imes 10^{-5}}+1=0.5+1 \
	herefore \quad \mu & =1.5
\end{aligned}$$

Answer

1.1

Answer

1.3

Answer

1.5

Answer

1.4

Waves Optics

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