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In a double-slit experiment the angular ...

In a double-slit experiment the angular width of the fringe is found to be `0.2^(@)` on a screen placed 1 m away. The wavelength of light used is 600 nm. What will be the angular width of the fringe if the entire experimental apparatus is immersed in water ? Take refractive index of water to be `4//3`?

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`0.15^(@)`
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