The light of wavelength 600 nm is incident normally on a slit of width 3mm. Calcualte the linear width of central maximum on a screen 3m away from the slit.

In Yong's double-slit experiment, the fringe width is 0.1 mm when light of wavelength 600 nm is used. Calculate the fringe width when the entire appartus is immersed in a medium of refractive index 4/3 by keeping the source of light in air.