The effective path length difference between the light that reflected off of the n2 medium and the light that reflected off the n1 medium is
Path length difference = 2t+λ/(2n2)
What is wavelength?
Generally, Wavelength is simply defined as the distance between points in the adjacent cycles of a waveform signal channeled through a space.
In conclusion, A light that travels through n2, travels in a time t, a distance before reflection from the n1 channel, travels a distance d before reaching the point from where it entered n2 channel.
Path length difference = 2t+λ/(2n2)
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