A thin plastic sheet of refractive index 1.6 is used to cover one of the slits, among the two slits, in a double-slit arrangement. The central point on the screen is now occupied by what would have been the 7 th bright fringe before the thin plastic sheet was used. If the wavelength of light is 600 rim, the thickness (in yurn) of the thin plastic sheet is
Text Solution
Verified by ExpertsThe correct answer is:
A
7
The change in path = ( 
- l)t. This path length change the position of bright fringe upto seventh bright fringe.
t ( 
- 1) = 7 
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