One Beam of Coherent Light Travels Path P₁ in Arriving

question 45

Multiple Choice

One beam of coherent light travels path P₁ in arriving at point Q and another coherent beam travels path P₂ in arriving at the same point. If these two beams are to interfere destructively, the path difference P₁ - P₂ must be equal to

• A)an odd number of half-wavelengths.
• B)an even number of half-wavelengths.
• C)zero.
• D)a whole number of wavelengths.
• E)a whole number of half-wavelengths.

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