Wave OpticsHard
Question
In Young′s double slit experiment using sodium light (λ = 5898
), 92 fringes are seen. If given colour (λ = 5461) is used, how many fringes will be seen
), 92 fringes are seen. If given colour (λ = 5461) is used, how many fringes will be seenOptions
A.62
B.67
C.85
D.99
Solution
On a given screen width m β = car tan, Here n is number of fringes ans β = 
is the fringe width
n1β1 = n2β1 ⇒ n2λ1 = n2λ2.
⇒ n2 =
99.360
Number of fringes are integers so n2 = 99
is the fringe width n1β1 = n2β1 ⇒ n2λ1 = n2λ2.
⇒ n2 =
99.360Number of fringes are integers so n2 = 99
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