What is the position of secondary maxima and minima?

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.

Write definitions:

Diffraction of light.

A diffraction pattern obtained from a double slit illuminated with monochromatic light is shown in the figure. The dotted line in the figure shows the diffraction envelope while the solid lines give the double slit interference fringes. The experimenter has an arrangement to keep the separation between the slits $\left(d\right)$ fixed, but varies the width of the slits$\left(a\right)$. The intensities of the peaks marked by$1$ and$2$ are $I_1$ and $I_2$ respectively. If the slits are made narrower while keeping the separation fixed, then the ratio $\frac{I_2}{ I_1}$