In a double slit experiment,the angular width | vedclass

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(B) The angular fringe width $	heta$ in a double slit experiment is given by the formula $	heta = \frac{\lambda}{d}$,where $\lambda$ is the waveleng

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$0.15$

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(B) The angular fringe width $	heta$ in a double slit experiment is given by the formula $	heta = \frac{\lambda}{d}$,where $\lambda$ is the wavelength of light and $d$ is the slit separation.When the apparatus is immersed in a medium with refractive index $\mu$,the wavelength of light changes to $\lambda' = \frac{\lambda}{\mu}$.The new angular width $	heta'$ becomes $	heta' = \frac{\lambda'}{d} = \frac{\lambda}{\mu d} = \frac{	heta}{\mu}$.Given $	heta = 0.2^{\circ}$ and $\mu = 4/3$,we have $	heta' = \frac{0.2}{4/3} = 0.2 	imes \frac{3}{4} = 0.15^{\circ}$.

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