![]() (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. In interference pattern, the width of all fringes are almost the same.Whereas, in the diffraction pattern, all the dark fringes are not of zero intensity. The dark fringes have zero or small intensity so that the bright and dark fringes can be easily distinguished in the interference pattern.The bright fringes are not of the same intensity in the single slit diffraction pattern. All the bright fringes have the same intensity in the interference pattern.The three distinguishing features that are observed in Young’s double slit experiment when compared to single slit diffraction pattern are, The maxima between the minima and the width of the central maximum is simply the distance between the 1st order minima from the centre of the screen on both sides of the centre.Īns.Single Slit Diffraction is that which produces refraction, interference, diffraction, reflection, etc when light travels in the air.It is defined as the source of light and the screen in which the pattern of diffraction is obtained effectively at the limited or finite distance from the diffracting system. Fresnel Diffraction occurs due to size of the obstruction.Fraunhofer Diffraction is defined as the source of light and the screen in which the pattern of diffraction is obtained effectively at the limitless or infinite distance from the diffracting system.Diffraction is chiefly of two types - Fraunhofer Diffraction and Fresnel Diffraction. ![]()
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