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Necessary condition for obtaining an interference pattern when light waves (of same frequency) from two points S1 and S2 superpose is:   Intensity of two waves Phase difference between the two waves at S1 and S2 must be 1) Must be equal Zero 2) Must be equal π  3) Must be equal Constant with time but not necessarily zero 4) Need not be equal Constant with time but not necessarily zero

Necessary condition for obtaining an interference pattern when light waves (of same frequency) from two points S1 and S2 superpose is:   Intensity of two waves Phase difference between the two waves at S1 and S2 must be 1) Must be equal Zero 2) Must be equal π  3) Must be equal Constant with time but not necessarily zero 4) Need not be equal Constant with time but not necessarily zero Correct Answer 4

Concept:

  • The superposition principle simply states that when two or more waves overlap in space, the resultant wave is equal to the algebraic sum of the individual waves.
  • Necessary conditions for superpose is that waves should be in the same frequency, the Direction of waves or phase angle should also be the same, and the amplitude of both waves should also same.

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  • Here one example is shown in the figure where  Y1 and Y2 are two waves with the same frequency and different amplitudes make the Resultant wave Y.

 

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