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Question

The wave front due to a source situated at infinity is :


A
spherical
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B
cylindrical
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C
planar
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D
none of these
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Solution

The correct option is D planar
  • when you considered it a large distance and measuring justice Mall section of it then it can be considered to be plane wavefront source at Infinity 
  • example the one coming from sun to earth surface is considered to be plain VU friend from light diverging from a point source will be spherical
  • So, the wave front due to a source situated at infinity is planar
  • Option  C is the right answer

Physics
NCERT
Standard XII

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