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ICSE Class 10 Answered

Why prism causes dispersion but slab somoy cause it ?
Asked by uttambose978 | 29 Jan, 2019, 09:37: AM
answered-by-expert Expert Answer
I assume the question is 'why prism causes dispersion of white light, but slab does not cause dispersion of white light  ?"
 
  1. In a prism the refraction of light at the two plane surfaces which are not parallel and inclined to each other.
  2. The dispersion of white light occurs at the first surface of the prism where its constituent colours deviate through different angles.
  3. At the second surface, these split colours suffer only refraction and they get further separated.
  4. But in a rectangular glass block, the refraction of light takes place at the two parallel surfaces.
  5. At the first surface, although the white light splits into its constituent colours on refractions they split colours on suffering refraction at the second surface emerge out in the form of a parallel beam, which gives an impression of white light.
  6. Hence, the refraction of light is completely reversed due to the parallel surfaces of a glass slab which is not possible in a prism as the surfaces are not parallel to each other. 
 
Answered by Shiwani Sawant | 29 Jan, 2019, 12:35: PM

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