Two Coherent Sources of Monochromatic Light Are Located at S₁ $\lambda$

question 101

Multiple Choice

Two coherent sources of monochromatic light are located at S₁ and S₂ as shown. If the sources are in phase, the intensity at point P is a maximum when

• A) d =\(\lambda\)
• B) r₂ + r₁ = \(\lambda\)
• C) r₂ - r₁ = \(\lambda\)
• D) r₂ + r₁ = \(\lambda\)/2
• E) r₂ - r₁ = \(\lambda\)/2

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