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  4. In a single slit, Fraunhofer diffraction experiment, with a decrease in the width of the slit, the width of the central maximum

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Q. In a single slit, Fraunhofer diffraction experiment, with a decrease in the width of the slit, the width of the central maximum

NTA AbhyasNTA Abhyas 2020Wave Optics

Solution:

Width of the central maximum is independent of intensity of the source.
Its width is given by $\beta =\frac{2 \lambda D}{d}$ , where $d$ = width of slit
i.e., $\beta \propto \frac{1}{d}$ ; hence as $d$ decreases, $\beta $ increases.