Two light ways having the same wavelength in vacuum are in phase initially. Then, the first ray travels a path L 1 through a medium of refractive index μ 1 while the second ray travels a path L 2 thro

Question

Two light ways having the same wavelength in vacuum are in phase initially. Then, the first ray travels a path L 1 through a medium of refractive index μ 1 while the second ray travels a path L 2 through a medium of refractive index μ 2 . The two waves are then combined to observe interference. The phase difference between the two waves is

TestHub · Accepted Answer

Optical path for first ray = μ 1 L 1 Optical path for second ray = μ 2 L 2 So, phase difference is given by Δ ϕ = 2 π λ × path difference = 2 π λ × Δ x ⇒ Δ ϕ = 2 π λ μ 1 L 1 - μ 2 L 2

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