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

Question:
Fringe spacing ∆Y is the distance between two adjacent bring fringes

Option A):
∆Y = dλ/L
Option B):
∆Y = Lλ/d  m
Option C):
∆Y  = Lλ/d
Option D):
∆Y = Ld/λ

Correct Answer is Option C):
∆Y  = Lλ/d