Geometrical OpticsHard
Question
n the ideal double-slit experiment, when a glass-plate (refrective index 1.5) of thicness t is introduced in the path of one of the interfering beams (wavelength λ), the intensity at the position where the central maximum thickness of the glass-plate is
Options
A.2λ
B.
C.
D.λ
Solution
Path difference due to t R1 = R2 slab should be intergral multiple of λ or
ᐃx = nλ
or (μ - 1)t = nλ n = 1, 2, 3,....
or
For minimum value of t, n = 1
∴
ᐃx = nλ
or (μ - 1)t = nλ n = 1, 2, 3,....
or
For minimum value of t, n = 1
∴
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