1.

A beam of light of wavelenght 600 nm from a distant source falls on a single slit 1.00 nm 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

Answer»

1.2 cm
1.2 mm
2.4 cm
2.4 mm

Solution :DISTANCE between the FIRST dark FRINGES on either side = width of central maximum
`=(2Dlambda)/(d)=(2xx2xx600xx10^(-9))/(1.00xx10^(-3))=2.4xx10^(-3)m=2.4mm`


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