Light of wavelength 6000Å is incident on a slit of width 0.30 mm. The screen is placed 2 m from the slit. Find (a) the position of the first dark fringe and (b). The width of the central bright fringe.

Explanation

The width of the central fringe
`y=2x=2x 4x 10^-3 =8 times 10^-3 m=8 mm`