In a YDSE fringes are observed by using light of wavelength 4800 Å, if a glass plate ( μ μ = 1.5) is introduced in the path of one of the wave and another plates is introduced in the path of the ( μ μ = 1.8) other wave. The central fringe takes the position of fifth bright fringe. The thickness of plate will be
Text Solution
Verified by ExpertsThe correct answer is:
A
Shift due to the first plate 
(Upward)
and shift due to the second 
(Downward)
Hence net shift = x 2 – x 1 
⇒ ⇒ 
⇒ ⇒ 
.
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