i thnk i took the shift wrong... it will be mu-1.
Central fringe of interference pattern produced by light of wavelength 6000A is found to shift to position of 4th dark fringe after glass sheet of refractive index=1.5 is introduced.Find thickness of glass sheet.
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4 Answers
skygirl
·2009-02-27 04:21:07
see, 4th dark fringe =(2X4+1)λD/2d = 9λD/2d =y
now, Δx = yd/D
put y value here.
then u will get Δx.
now this shift is due to the slab ...
shift prodused by slab = μt
equate n get 't' .. :)
theking
·2009-03-03 19:19:52
Didi you are completely wrong
Δx=(2n-1) λ /2 =( μ -1)t
which gives t=4.2 μm