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If the path difference must be half-integral number wavelength?

ECAT Engineering Exams Quizzes MCQs Quizzes ECAT Engineering Entry Test 2017 Physics Physical Optics 2

Question:
If the path difference must be half-integral number wavelength

Option A):
d sin θ = (m + 1/2)n/λ
Option B):
d sin θ = (m + 1/2) 1/λ
Option C):
d sin θ = (m + 1/2) λ
Option D):
d sin θ = (m + l)λ

Correct Answer is Option C):
d sin θ = (m + 1/2) λ

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