As an admirer of Thomas Young, you perform a double-slit experiment in his honor. You set your slits 1.15 mm apart and position your screen 3.23 m from the slits. Although Young had to struggle to achieve a monochromatic light beam of sufficient intensity, you simply turn on a laser with a wavelength of 633 nm . How far on the screen are the first bright fringe and the second dark fringe from the central bright fringe?

The distance of the first bright fringe is given as  

The distance of the second dark fringe from the central bright fringe is given as  

Explanation:

From the question we are told that

     The slit separation distance is  

      The distance of the slit from the screen is  

        The wavelength is

For constructive interference to occur the distance between the two slit is mathematically represented as

 Where m is the order of the fringe which has a value of 1 for first bright fringe

    Substituting  values

For destructive  interference to occur the distance between the two slit is mathematically represented as

      m = 2

so the formula to get the dark fringe is

 Now substituting values

close lines strong magnet less close weaker

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