CBSE Class 12-science Answered
Answer the following question:
Asked by nkrbasak | 05 Sep, 2012, 11:04: AM
Expert Answer
The light disperses while moving from one medium to another medium.
It happens in all the cases.
Eg. in a glass slab, when light goes into it, each colour has a different frequency and thus a different refractive index with respect to the medium. Hence they disperses due to different angle of refraction for each colour.
Now when the dispersed light moves to the opposite slab, it has the same angle of incidence as the angle of refraction by the first face. Hence they again refract to recombine and give the normal ndispersed light.
In case of prism, the second face is at a different angle with respect to the first face and hence this time they refract at a different angle to give a dispersed light and not recombine.
Infact many times dispersion do take place in lens also but it is very small due to its geometrical symmetry.
Answered by | 16 Sep, 2012, 09:32: AM
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