Light of wavelength 
is used to form interference pattern in Young’s double slit experiment. A uniform glass plate of refractive index 1.5 and thickness 
is introduced in the path of one of the interfering beams. The number of fringes which will shift the cross wire due to this is
Text Solution
Verified by ExpertsThe correct answer is:
A
The number of fringes shifting is decided by the extra path difference produced by introducing the glass plate. The extra path difference is ( μ μ – 1) t = n λ λ
or 
⇒ ⇒ n = 100
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