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In the figure below, P and Q are two equally intense coherent sources emitting radiation of wavelength 20 m. The separation between P and Q is 5 m and the phase of P is ahead of that of Q by 90°. A, B and C are three distinct points of observation, each equidistant from the midpoint of PQ. The intensities of radiation at A, B, C will be in the ratio:


Option 1 -

0:1:4


Option 2 -

2:1:0

Option 3 -

0:1:2

Option 4 -

4:1:0

0 7 Views | Posted 2 months ago
Asked by Shiksha User

  • 1 Answer

  • V

    Answered by

    Vishal Baghel | Contributor-Level 10

    2 months ago
    Correct Option - 2


    Detailed Solution:

    Φ? = π/2 - (2π/λ)x = π/2 - (2π/20)5 = 0
    Φ_B = π/2
    Φ_C = π/2 + (2π/λ)x = π/2 + π/2 = π
    I_A = 4I? ; I_B = 2I? ; I_C = 0

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