In a single slit diffraction, the width of slit is `0.5 cm`, focal lengths of lens is 40 cm and wavelength of light is 40 cm and wavelength of light i
In a single slit diffraction, the width of slit is `0.5 cm`, focal lengths of lens is 40 cm and wavelength of light is 40 cm and wavelength of light is `4890Å`. Distance of rist dark fringe is
A. `2xx10^(-5)m`
B. `4xx10^(-5)m`
C. `6xx10^(-5)m`
D. `8xx10^(-5)m`
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Correct Answer - B
`(f~~D):.axx(X)/(D)=nlamda`
`:.x=(1xx4890xx10^(-10)xx0.4)/(5xx10^(-3))=4xx10^(-5)m`
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