Error Analysis contd..


Rules:

1)'D' is the distance b/w the virtual sources and the eyepiece, measured with a scale of least count 1mm.
Procedure: The virtual sources are at '0' on the optical bench (no zero error). The coordinate of the eyepiece is taken.

2)The fringe width and 'd1' and 'd2' (displacement method values) are measured with a micrometer screw of LC .01mm.
Procedure:: The cross-hair is set at a good- dark fringe (or at the image of a virtual source). Then it is moved to the 25th fringe (or to the image of the other virtual source). The difference between the 2 readings is taken.

Find the wavelength of the light used. What light is this?

11 comments:

  1. ShivankerMarch 21, 2011 at 3:15 PM

    wavelength=6.3x10^(-7)±4.8x10^(-9)
    Red Light

    ReplyDelete
  2. shaanMarch 21, 2011 at 4:03 PM

    [1.5636 +/- .468]*10^(-6)
    infrared lt


    ...ut infrared lt dikhegi kaise?..:p

    ReplyDelete
  3. shaanMarch 21, 2011 at 4:10 PM

    i've assumed fringe separation given is for 25, not 1 fringe.

    ReplyDelete
  4. AnonymousMarch 24, 2011 at 7:46 PM

    pl confrm

    ReplyDelete
  5. AnonymousMarch 24, 2011 at 11:07 PM

    shivanker, shaaan-how'd u get dat, i'm getting nowhere close..

    ReplyDelete
  6. ShivankerMarch 25, 2011 at 9:05 AM

    @anonymous: read the discussion here: http://anujkalia.blogspot.com/2011/03/fresnel-biprism.html

    ReplyDelete
  7. AnujMarch 25, 2011 at 4:45 PM

    here are the various errors:

    D : 2mm.
    d: 1/2(.01+.01)mm.
    fringe width: (1/25)*(.02)mm.

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  8. AnonymousMarch 25, 2011 at 9:22 PM

    bhaiya
    shudn't error of fringe width be (1/25)*(.01)mm?

    ReplyDelete
  9. ShivankerMarch 28, 2011 at 5:22 PM

    bhaiya.. I always have this doubt..
    At some places Maximum Error is taken as the Least Count.. and at the other, twice of it..

    which one should we prefer?

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  10. AnujMarch 28, 2011 at 6:13 PM

    its a matter of 'fact' rather than 'preference'.

    when we take differences in readings of the instrument, error is 2*LC.

    however, if we start from 0, and use an instrument without zero error, then error is 1*LC.

    ReplyDelete
  11. ShivankerMarch 28, 2011 at 10:46 PM

    so what do we take as dx in the formulae for error analysis? :D

    ReplyDelete

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