Step1: Set the value of width of the slit constant throughout the experiment.
Step2: Click on diffraction pattern or Intensity Profile
Step3: Change the value of angle of observation (θ) Step5: use the formula Dsinθ = mλ where D is the width of the slit , θ is the angle of observation, m is the order of minima and λ is the wavelength which needs to be calculated.
Step6: Repeat the process 5 times. Take the average of the values of λ .