question

(a)  describe any two characteristic features which distinguish between interference and diffraction phenomena. derive the expression for the intensity at a point of the interference pattern in young’s double slit experiment.

(b)  in the diffraction due to a single slit experiment, the aperture of the slit is

 . if monochromatic light of wavelength  is incident  normally on the slit, calculate the separation between the first order minima and the 3rd order maxima on one side of the screen. the distance between the slit and the screen is .

 

 

 

 

 

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