In the set up shown in Fig the two slits, 
and 
are not equidistant from the slit S . The central fringe at O is then
Text Solution
Verified by ExpertsThe correct answer is:
C
If path difference Δ Δ = ( SS 1 + S 1 O ) – ( SS 2 + S 2 O ) = n λ λ n = 0, 1, 2, 3, .... the central fringe at O is a bright fringe and if the path difference 
λ λ , n = 1, 2, 3, ..... the central bright fringe will be a dark fringe.
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