In a double slit arrangement fringes are produced using light of wavelength 4800 Å . One slit is covered by a thin plate of glass of refractive index 1.4 and the other with another glass plate of same thickness but of refractive index 1.7. By doing so the central bright shifts to original fifth bright fringe from centre. Thickness of glass plate is
Text Solution
Verified by ExpertsThe correct answer is:
A
Shift 
Shift due to one plate 
Shift due to another path 
Net shift 
…..(i)
Also it is given that 
…..(ii)
Hence 
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