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![[Post New]](/templates/default/images/icon_minipost_new.gif) 25 Jun 2008 19:49:44 IST
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after passing through a parallel sided glass slab a ray of chromatic light does not show any dispersion why ?
even though the glass is a dispersive medium.
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25 Jun 2008 19:55:56 IST
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Because no refraction takes place.....only a bit of reflection and more of transmission takes place. It must make an angle with the normal for refraction to take place and hence, dispersion.
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25 Jun 2008 21:11:35 IST
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Good question. 
Dispersion takes place. BUT, as u can see in the figure, a glass slab can be assumed to be made up of 2 prisms cancelling each other's effects. So no net dispersion takes place.
One prism disperses the white light into colours and the other prism again transforms it to white light.
Hope u get it.
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