The figure shows a surface XY separating two transparent media, medium–1 and medium–2 …

Physics · JEE Advanced · NTA ExamsOptics


The figure shows a surface XY separating two transparent media, medium–1 and medium–2 . The lines ab and cd represent wavefronts of a light wave travelling in medium–1 and incident on XY. The lines ef and gh represent wavefronts of the light wave in medium–2 after refraction.
 The phases of the light wave at c, d, e and f are φc, φd, φe and φf respectively. It is given that φc  φf
  1. c cannot be equal to d
  2. d can be equal to e
  3. (d – f) is equal to (c – e)
  4. None of these

Answer

(C) (  d –  f) is equal to (  c –  e)

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