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1)

Two light rays having the same wavelength in vacuum are in phase initially. Then, the first ray travels a path L1 through a medium of refractive index  μ1 while the second ray travels a path L2 through a medium of refractive index μ2. The two waves are then combined to observe interference. The phase difference between the two waves is 


A) 2πλ(L1μ1L2μ2)

B) 2πλ(L2L1)

C) 2πλ(μ2L1μ1L2)

D) 2πλ(μ1L1μ2L2)

Answer:

Option D

Explanation:

 First ray optical path=  μ1L1

 Second ray optical path= μ2L2

 So, phase difference 

       ϕ=2πλ× path difference=2πλ×x

ϕ=2πλ(μ1L1μ2L2)