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QJEEM20Ph02bc: JEE Main 2020 Physics - Class 12 JEEM20Ph02bc Solution: Two light waves having the same wavelength λ in vacuum are in…

Two light waves having the same wavelength λ in vacuum are in phase initially. Then the first wave travels a path L1 through a medium of refractive index n1 while the second wave travels a path of length L2 through a medium of refractive index n2 . After this the phase difference between the two waves is :

Multiple Choice Options

  • A 2πλ(n1L1−n2L2)
  • B 2πλ(n2L1−n1L2)
  • C 2πλ(L1n1−L2n2)
  • D 2πλ(L2n1−L1n2)

Step-by-Step Verified Solution

Phase difference = 2πλ × optical path difference

= 2πλ(n1L1−n2L2)

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