71. In a Young.s double slit interference experiment, monochromatic light placed behind a single slit illuminates two narrow slits and the interference pattern is observed on a screen placed some distance away from the slits. Which one of the following decreases the separation of the fringes? A. increasing the width of the single slit B. decreasing the separation of the double slits C. increasing the distance between the double slits and the screen D. using monochromatic light of higher frequency

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