Maximum number of bright fringes visible in YDSE with d/λ = 4:
A8
BInfinite
C4
D9 (m from -4 to +4, since |sin θ| ≤ 1)
Answer & Solution
Correct answer: D. 9 (m from -4 to +4, since |sin θ| ≤ 1)
Condition: d sin θ = m λ requires |m| ≤ d/λ = 4. So m = -4, -3, ..., 3, 4 → 9 fringes.
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