Wave OpticsHard
Question
Let S1 and S2 be the two slits in Young’s double slit experiment. if central maxima is observed at P and angle ⎳S1PS2 = θ, the the fringe width for the light of wavelength λ will be. (Assume θ to be a small angle )
Options
A.λ / θ
B.λθ
C.2λ / θ
D.λ / 2θ
Solution
As distance between S1 & S2 is very much less and equal to d′ so the angle made at ′P′ is very much small
∴ Angle =
⇒ θ 
∴ Fringe width =
∴ Angle =
⇒ θ ∴ Fringe width =
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