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In a single slit differaction pattern a monochromatic light of wavelength 500nm is used if angular position of the point where waves interfere from slit is `10^(-3)` radians from line of central maxima. If width of the slit is `500 mum`, then order of minima obtained on screen will be

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For `n^"th"` order minima
`theta=(nlambda)/a`
`10^(-3 )=(nxx500xx10^(-9))/(500xx10^(-6))`, n= 1st order

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