![]() (b) (i) For the given monochromatic waves, if the width of the slit is decreased, the fringe pattern becomes broader. Thus, net contribution from the two halves is zero and with that intensity falls to zero for path difference, Δ = nλĬondition for maxima: If slit AB is parted into three equal halves and if two thirds of the slit having a path difference λ/2 between them cancel each other and only the remaining one third of the set contributes to the intensity at the point between two minima, so the path difference, Δ =(n +1/2)λ (5 marks)Ĭondition for minima: If the set AB is parted into equal halves each of size d/2, for every point in part AM, there is a point in part MB that contributes the secondary wavelets out of phase. (ii) the monochromatic source of light is replaced by a white light. (b) How would the diffraction pattern be affected when Derive the conditions when secondary wavelets originating from the slit interfere to produce maxima ans minima on the screen. Ques 15) (a) A monochromatic source of light of wavelength λ illuminates a narrow slit of width d to produce a diffraction pattern on the scree. On the other hand, in a diffraction pattern, the fringes are of different widths.
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