The conditions to produce Interference
- The two interfering sources must be coherent.
- The two interfering waves must have the same amplitude or nearly equal amplitude.
- The waves should have a certain path difference.
- The light source used must be monochromatic.
- The two sources must be very close to each other.
- The two sources should be very narrow.
- For consecutive interference, path difference = nλ, and for destructive interference, path difference = \(\left(n+\frac12\right)\lambda\), where n is the integer and λ is the wavelength of light is used.