Two Coherent Sources of Monochromatic Light Are Located at S₁

question 90

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 = l.
• B) r₂ + r₁ = l.
• C) r₂ - r₁ = l.
• D) r₂ + r₁ = l/2.
• E) r₂ - r₁ = l/2.

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