If we observe the single slit Fraunhofer diffraction with wavelength $\lambda$ and slit width d, the width of the central, maxima is $2\theta .$ On decreasing the slit width for the same $\lambda$

• A

  $\theta$ increases

• B

  $\theta$ remains unchanged

• C

  $\theta$ decreases

• D

  $\theta$ increases or decreases depending on the intensity of light