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Determine the phase difference ϕ when the path difference AP - BP equals λ for the first minimum at point P.

1. ϕ equals π radians
2. ϕ equals 2π radians
3. ϕ equals π/2 radians
4. ϕ equals 3π/2 radians

Correct answer: ϕ equals π radians

Solution

For the first minima in an interference pattern, the path difference is equal to one wavelength (λ). The corresponding phase difference is given by ϕ = 2π × (path difference/λ). Substituting path difference = λ, we get ϕ = 2π × (λ/λ) = π radians.

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