A beam of light of `lambda=600nm` from a distance source falls on a single slit `1mm` wide and the resulting diffraction pattern is observed on a screen `2m` away. The distance between first dark fringes on either side of the central bright fringe isA. (a) `1.2cm`B. (b) `1.2mm`C. (c) `2.4cm`D. (d) `2.4mm`

A beam of light of `lambda=600nm` from a distance source falls on a si

1.	A beam of light of `lambda=600nm` from a distance source falls on a single slit `1mm` wide and the resulting diffraction pattern is observed on a screen `2m` away. The distance between first dark fringes on either side of the central bright fringe isA. (a) `1.2cm`B. (b) `1.2mm`C. (c) `2.4cm`D. (d) `2.4mm`
Answer» Correct Answer - D Given `D=2m`, `d=1mm=1xx10^-3m` `lambda=600nm=600xx10^-6m` Width of central bright fringe `(=2beta)` `=(2lambdaD)/(d)=(2xx600xx10^-6)/(1xx10^-3)m` `=2.4xx10^-3m=2.4mm`

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