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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 Feb 2008 20:54:57 IST
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Dm = A(  -1) for a prism; where Dm=Min angle of deviation , A is the angle of the prism & is the refractive index of the prism. If A and are const (i.e we have the same prism) but different colours of light falling on it then why do some colours deviate more and some less ... in the formula is the ref ind of the glass prism and not of the light falling on it...? Please clarify quickly!!
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There is no better feeling in this world than being a winner! |
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5 Feb 2008 21:32:25 IST
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the colours deviate differently due to different wavelengths... and
C = lambda x frequency ........where lambda is wavelength.
so if lambda is more, frequency will be less, so it will be less energetic so it will cover a given distance in longer time than others so it desires to cover least distance as possible and hence deviates least.
red has highest wavelength and it deviates the least, violet has least wavelength and deviates the most....
violet has least wavelength hence max frequency hence max energetic and hence can cover larger distance in the medium for the same time as others, and so that the colours emerge at the same time, it desires to cover larger distance so that its higher speed is compensated for.. so it deviates the most.
n i think gauche's formula also is helpful here.
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- Gaurav Ragtah (spideyunlimited)
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5 Feb 2008 21:55:22 IST
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The bottom line is in
dm = A (  - 1 )
changes with colour ( i, e wavelength )
so dispersion .
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it is not important where u stand, but in which direction u are moving |
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5 Feb 2008 22:17:46 IST
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a small clarification Ramyani's formula is applicable only for small angles of prisms
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5 Feb 2008 23:56:44 IST
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elastiboysai is right.
i just used the formula given by joyfrancis.
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it is not important where u stand, but in which direction u are moving |
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6 Feb 2008 10:08:16 IST
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areyy guys....see...
ref index = speed of light in vacuum / speed of light in medium
and we know speed = wavelenght x frequency.....
so as and when color changes wavelength changes......and so does the ref index.........it must be different for different colors....ok
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............................................................................................................................................................................................
There's Light at the end of every Tunnel, so KEEP MOVING....
Best of luck to all my mates....
............................................................................................................................................................................................
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7 Feb 2008 20:36:49 IST
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see
acc. to cauchy's principle
refractive index=a+b/lambda sq.+c/lambda^4
thus r.i changes with wavelength
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7 Feb 2008 20:55:29 IST
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refractive index of the glass prism is changing according the light falling on it???weird!!
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7 Feb 2008 21:01:55 IST
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read case of dispersion
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7 Feb 2008 21:03:24 IST
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if u have gc agrawall read page85
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7 Feb 2008 21:05:19 IST
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if u donot have
buy
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8 Feb 2008 21:12:36 IST
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arre
Refractive index = speed of light (of given colour.. or white) in vacuum / speed of light in medium
so speed of different components of light in glass will be different so denominator will change
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- Gaurav Ragtah (spideyunlimited)
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8 Feb 2008 21:14:16 IST
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see my answer once again.....
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There's Light at the end of every Tunnel, so KEEP MOVING....
Best of luck to all my mates....
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