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In the experiment of diffraction at a single slit, if the slit width is decreased, the width of the central maximum:

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decreases is Fresnel diffraction but increases in Fraunhofer diffraction.

increases in both Fresnel and Fraunhofer diffraction.

decreases in both Fresnel and Fraunhofer diffraction.

increases in Fresnel diffraction but decreases in Fraunhofer diffraction.

answer is D.

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Detailed Solution

In both types of diffraction,

Angular width of central maximum, $θ \propto \frac{λ}{d}$

if width of the slit (d) is decreased, the angular width of central maxima will increase in both type of diffraction.

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