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What is the condition for constructive interference in terms of path difference $\Delta x$ for light waves of wavelength $\lambda$?
- A.Delta x equals n lambda
- B.Delta x equals (2n plus 1) lambda divided by 2
- C.Delta x equals n lambda divided by 2
- D.Delta x equals (n plus 1) lambda
Show correct answer & step-by-step solution
Correct answer: A — Delta x equals n lambda
Solution
Constructive interference occurs when the path difference between two waves is an integer multiple of the wavelength. This is expressed as where is an integer.
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