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The condition for constructive interference is path difference should be equal to :

1. odd integral multiple of wavelength
2. Integral multiple of wavelength
3. odd integral multiple of half wavelength
4. Integral multiple of half wavelength

Correct answer: Integral multiple of wavelength

Solution

For constructive interference, the two waves must reinforce each other, which occurs when their phase difference is 0, 2π, 4π, etc. That corresponds to a path difference of nλ, where n is any integer.

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