The slits in a Young's double slit experiment have equal width and the source is placed symmetrically with respect to the slits.
The slits in a Young's double slit experiment have equal width and the source is placed symmetrically with respect to the slits. The intensity at the central fringe is 4 . If one of the slits is closed, the intensity at this point will be
(a) Io
(b) lo/4
(c) Io/2
(d) 4Io.
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The correct answer is (b) IO/4
EXPLANATION:
As in the previous explanation the maximum intensity
I₀ = (√I₁ + √I₂)². Here given that I₁ = I₂ = I (say).
→I₀ = 4 I ------- (i)
If one slit is closed I₀' = I
→I₀' = I₀/4 {from (i)}
Hence option (b)
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