You pass 633 nm laser light through a narrow single slit of width 0.24 mm and observe the diffraction pattern on a screen 6.0 m away. If the intensity at the central bright is Io , what is the intensity at a point on the screen 3.0 mm from the center of the pattern?

The intensity is  

Explanation:

From the question we are told that

   The wavelength is  

   The width of the slit is

   The distance from the screen is  

   The distance of the position considered from the center is

  Generally the intensity from at a point on the screen 3.0 mm from the center of the pattern is

 Here   is the intensity of the central bright fringe

=>    

=>            

it has to be b, about 97 percent.

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