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Wave Optics — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
MCQ
Two identical light waves having phase difference $\phi$ propagate in same direction. When they superpose, the intensity of resultant wave is proportional to
  • A
    $\cos ^2 \phi$
  • ✓
    $\cos ^2 \frac{\phi}{2}$
  • C
    $\cos ^2 \frac{\phi}{3}$
  • D
    $\cos ^2 \frac{\phi}{4} \quad$
✓

Answer

Correct option: B.
$\cos ^2 \frac{\phi}{2}$
(b) : For two identical light, the intensity of resultant wave is
$
I_R=4 I \cos ^2 \frac{\phi}{2} \text { or } I_R \propto \cos ^2 \frac{\phi}{2}
$

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