The condition for obtaining secondary maxima in the diffraction pattern due to single slit is 

Draw a labelled graph of the intensity of diffracted light $\left(I\right)$ versus angle$\left(\theta \right)$ in the Fraunhofer diffraction experiment for a single-slit diffraction.

For a given single slit, the diffraction pattern is obtained on a screen first by using red and then by blue light. In which case, will the central maxima, in the observed diffraction pattern have a larger angular width?