allerySingle-slit diffraction first minimum occurs at angle θ where:
Aa sin θ = λ
Ba sin θ = 2λ
C2a sin θ = λ
Da cos θ = λ
Answer & Solution
Correct answer: A. a sin θ = λ
For single-slit diffraction of slit width a: first minimum at a sin θ = λ.
Higher-order minima at a sin θ = 2λ, 3λ, etc.
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