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Why dispersion does not occur in a glass slab?

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Why dispersion does not occur in a glass slab?
I know the reason that the opp. sides are parallel but dispersion occurs when light enters from one medium to another.. so what is the reason?prism

Asked Karan

Answer

glass slabThough there is slight dispersion when light enters glass slab at the first phase, all the colours are rendered parallel at the second phase and the different colours enter our eye without any angular separation. (Angular dispersion is the angle between the component colours and if the angle between the colours is zero, we will not see the colours)

Also read http://www.askphysics.com/why-dispersion-does-not-occur-in-a-glass-slab/

 

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