Obtain the ratio of the interference fringe-widths ${\beta }_1$ and ${\beta }_2$ obtained with monochromatic red light of ${\lambda }_1=660 \mathrm{nm}$ and ultraviolet light of ${\lambda }_2=330 \mathrm{nm}$.

Widths of the two slits in Young’s experiment are in the ratio $4:1$. What is the ratio of the amplitudes of light waves emitted from them?

Young’s double-slit experiment was performed with monochromatic light of blue colour. The experiment was then repeated, first with light of red colour and then with light of yellow colour. Which colour produces interference pattern with maximum fringe separation (i.e., fringe-width)?

How is fringe-width of an interference pattern in Young’s double-slit experiment affected if the two slits are brought closer to each other?

In Young’s double-slit experiment, the intensity of a bright fringe is $I$. What will be the intensity at the same place if one slit is closed?