Two slits separated by d emit light of wavelength λ. Angular separation of fringes:
Aλ/d (small-angle: β/D = λ/d)
Bd/λ
Cλ × d
DIndependent of d
Answer & Solution
Correct answer: A. λ/d (small-angle: β/D = λ/d)
Angular fringe separation = β/D = λ/d. Smaller d gives wider angular spread of fringes. (Inverse relation: small slit separation produces widely spaced fringes.)
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