wave optics

IIT JEE 2015 Questions › Optics questions › wave optics

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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skygirl ·2009-02-27 04:21:07

see, 4th dark fringe =(2X4+1)Î»D/2d = 9Î»D/2d =y

now, Î”x = yd/D

put y value here.

then u will get Î”x.

now this shift is due to the slab ...

shift prodused by slab = Î¼t

equate n get 't' .. :)

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theking ·2009-03-03 19:19:52

Didi you are completely wrong
Î”x=(2n-1) Î» /2 =( Î¼ -1)t

which gives t=4.2 Î¼m

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skygirl ·2009-03-03 19:28:22

i thnk i took the shift wrong... it will be mu-1.

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theking ·2009-03-03 19:41:26

Yes.

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wave optics

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