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Question

In YDSE, find the thickness of a glass slab (μ=1.5) which should be placed before the upper slit S1 so that the central maximum now lies at a point where 5th bright fringe was laying earlier (before inserting the slab). Wavelength of light used is 5000˙A.
  1. 5×106m
     
  2. 3×106m
     
  3. 10×106m
     
  4. 5×105m


Solution

The correct option is A 5×106m
 
According to the question, Shift = 5 fringe widths
(μ1)tDd=5λDd  t=5λμ1=50,000˙A =5×106m

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