question_answer

In the experiment of diffraction at a single slit, if the slit width is decreased, the width of the central maximum [KCET 2001]

A)            Increases in both Fresnel and Fraunhofer diffraction

B)            Decreases both in Fresnal and Fraunhofer diffraction

C)            Increases in Fresnel diffraction but decreases in Fraunhofer diffraction

D)            Decreases in Fresnel diffraction but increases is Fraunofer diffraction.