allerySingle-slit diffraction first minimum at angle θ satisfies:
Aa sin θ = 2λ
Ba sin θ = λ
CNo formula
Da sin θ = λ/2
Answer & Solution
Correct answer: B. a sin θ = λ
For slit width a, first minimum at a sin θ = λ.
Subsequent minima at a sin θ = n λ (n = 1, 2, ...).
Central maximum is wide; secondary maxima are dimmer.
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