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  4. With a monochromatic light, the fringe-width obtained in a Young's double slit experiment is 0.133 cm. The whole setup is immersed in water of refractive index 1.33, then the new fringe-width is

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Q. With a monochromatic light, the fringe-width obtained in a Young's double slit experiment is $0.133\, cm$. The whole setup is immersed in water of refractive index $1.33$, then the new fringe-width is

Wave Optics

Solution:

$\beta^{\prime}=\frac{\beta}{\mu}=\frac{0.133}{1.33}=0.1 \,cm$