In Young's experiment, using red light $\left(\lambda =6600 \overrightarrow{\mathrm{A}}\right),60$ fringes are seen in the field of view. How many fringes will be seen by using violet light $\left(\mathrm{\lambda }=4400\overrightarrow{\mathrm{A}}\right)$ 

A Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is

In Young's double slit experiment $12$ fringes are observed to be formed in a certain segment of the screen when the light of wavelength $600 \mathrm{nm}$ is used. If the wavelength of the light is changed to $400 \mathrm{nm}$, number of fringes observed in the same segment of the screen is given by