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JEE Advanced2007PhysicsRay OpticsActual

Paragraph: The figure shows a surface X Y separating two transparent media, medium-1 and medium-2. The lines a b and c d represent wavefronts of a light wave travelling in medium-1 and incident on X Y . The lines ef and g h represent wavefronts of the light wave in medium-2 after refraction. Question: The phases of the light wave at c, d, e and f are _c, _d, _e and _f , respectively. It is given that _c _f .

Options

  1. A_c cannot be equal to _d
  2. B_d can be equal to _e
  3. C( _d- _f ) is equal to ( _c- _e )
  4. D( _d- _c ) is not equal to ( _f- _e )

Correct answer

C. ( _d- _f ) is equal to ( _c- _e )

Step-by-step solution

All points on a wavefront are at the same phase. array rlrl & _d & = _c and _f= _e & & _d- _f & = _c- _e array Hence, the correct option is (c).

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