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A slit of width d is illuminated by red ...

A slit of width d is illuminated by red light of wavelength `6500Å` For what value of d will the first maximum fall atangle of diffractive of `30^(@)`

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For first secondary maximum of the diffraction pattern,
`d isn theta =(3lambda)/2`
`:. D=(3lambda)/(2 sin theta)=(3xx6,500xx10^(-10)m)/(2xx sin 30^(@))=1.95 xx 10^(-6)m`
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