A beam of light of wavelength from a distance source falls on a single slit wide and a resulting diffraction pattern is observed on a screen away. The distance between the first dark fringes on either side of central bright fringe is
Step 1: Given data
Wavelength of a light,
Width of a slit,
Distance between screen and slit,
For first dark fringe,
Let the distance between the central fringe and first dark fringe on one side
Step 2: Calculating the distance between first dark fringes on either side of central bright fringe
The formula to calculate the distance between the first fringe and the central bright fringe is given below,
Therefore the total distance between the first dark fringes on either side of central bright fringe is
Hence, option (C) is the correct answer.