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A beam of light of wavelength 600 nm fro...

A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is

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`sin theta=(lamda)/d`
or `theta=(600xx10^(-9))/(1xx10^(-3))`
or `theta=6xx10^(-4)` rad
`:.beta =D theta`
`=2xx6xx10^(-4)=1.2xx10^(-3)m`
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