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![[Post New]](/templates/default/images/icon_minipost_new.gif) 27 Feb 2008 18:06:40 IST
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When white light instead of monochromatic light falls on a slit of YDSE
then one sees:
a no interference
b coloured fringes
c black and white fringes
d white central fringe with coloured fringes on either side
plzzz give the correct reason
rates assured
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27 Feb 2008 18:28:11 IST
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actually shud be 'a' ,,,, fringes ud be observed but it cant be very easily distinguished du to many freq. of light used.... and ya "b" is also possible... coloured fringes will be observed
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27 Feb 2008 18:32:01 IST
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but ans given is d
this is a problem from D C Pandey Otptics and Modern Physics
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27 Feb 2008 18:40:37 IST
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arey quest. of white light never comes untill and unless white light is incident... actually wat happens when white lit is incident is all the lights get into constituent colours but at centre they recombine again to gve white light.... this cannot be observed in any other place normally bcos... they usuall attain a path diff. and cannot recombine prop. to gve white light... thats why i sayed B option also.. and not last one hope i m clear to ya Cheers!!!!!!!
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27 Feb 2008 18:42:02 IST
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ya i do think the ans should be b
anyway thanx
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27 Feb 2008 18:44:17 IST
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oh!!!!!!!!!! me stupid....  i do make same mistakes not readin question completely....... yaar its given white light..... ans. is D for sure must be.... and ya a can also be a side ans. for multiple choice
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27 Feb 2008 18:45:06 IST
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plzzz explain the reason
D C PANDEY HAS given in pg 129 that only coloured fringes are formed
and the answer says something else
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27 Feb 2008 18:48:17 IST
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how is the recombination of constituent colours related to interference
??
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27 Feb 2008 18:49:53 IST
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Coloured fringes will be produced everywhere else except for the central fringe which is white Due to various levels of Constructive and destructive interference
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Cansomeonepleasetellmethelocationofthespacebar ?
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27 Feb 2008 18:50:16 IST
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do u realise y diff. colours are obtained? its bcos they hve diff. wavelenghth... and thus diff. path diff everytime.. now why at centre white light is formed is gven by me earliear... anyways actually wat happens when white lit is incident is all the lights get into constituent colours but at centre they recombine again to gve white light.... this cannot be observed in any other place normally bcos... they usuall attain a path diff. and cannot recombine prop. to gve white light... now that shud be clear... and srry 4 earlier silly mistake Cheers !!!!!!!
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27 Feb 2008 18:52:03 IST
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so finally answer should be D right???/
then it means that the theory point given in pg 129 is wrong
wanted this confirmation
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27 Feb 2008 18:52:40 IST
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yes agree wid ur reason madmax
and shubham ur reason too
so finally is the ans D
right????
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27 Feb 2008 18:55:44 IST
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arey no... (yes ans is D) its absolutely correct here see. recombination means they hve constructve interference.. specially here they reach a state where they were b4 ...rit while in white light... no path diff.. as if they didnt diffract at all...... understand now...... colours r formed as said but they dun alays interfere in perfect manner to give white light
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27 Feb 2008 18:57:10 IST
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The violet end of the spectrum (with the shortest wavelengths) is closer to the central WHITE fringe, with the other colours being further away in order.
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Cansomeonepleasetellmethelocationofthespacebar ?
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27 Feb 2008 18:57:15 IST
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yes thanx again
thanx to all
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