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Why glass slab don't show dispersion as prism does?

I have got two answers and I am confused

  1. The dispersion that occur at first interface with some angles , that hot reversed at second interface and hence, combine to form white light again

  2. Answer to Why does dispersion of light occur in a prism but not in a rectangular glass slab? by Yaman Sanghavi https://www.quora.com/Why-does-dispersion-of-light-occur-in-a-prism-but-not-in-a-rectangular-glass-slab/answer/Yaman-Sanghavi?ch=15&oid=68019156&share=ef2af85c&srid=hrHyD7&target_type=answer

In diagram(rough , sorry!) :-

  1. enter image description here

  2. enter image description here

Please tell which one is correct? And if neither than please answer it in detail.

Suresh Chandra Pal
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  • The dispersed rays are parallel to each other and do not diverge, hence our eyes still perceive them to be white light (The distance between parallel rays of different wavelengths is very small and it remains small) – Draculin Oct 27 '21 at 13:49
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    Close inspection, using either the edge of the glass (making a prism in essence), or using a light source that is small relative to the glass thickness will show chromatic aberration. – Jon Custer Oct 27 '21 at 14:12
  • @draculin, can you explain in a bit more detail what exactly you are telling in answer format, as this question want answer not I comment sir ?please sir explain in detail if possible a rough diagram explaining what EXACTLY is happening? Requesting – Suresh Chandra Pal Nov 12 '21 at 13:34
  • @ draculin, also please tell , that u said that when light come out from galss slab after dispersion than do they (adjacent)overlap and therefore appear white(read that linked answer please) or each ray disperse wavelength parallel and dispersed wavelength from adjacent do NOT overlap, just because of their small distance between the. It appears white to us? Basically is that ACTUALLY white formed after dispersion due to overlapping or just appear to us as brain cannt detect such minute distance between them ? Than what happen in prism , distance between dispersed wavelength is also very – Suresh Chandra Pal Nov 12 '21 at 13:43
  • Small to notice by eyes( comparatively larger than slab stoll smaller for brain to notice)still we can see spectrum . Please must include these doubts in your answer please sir requesting – Suresh Chandra Pal Nov 12 '21 at 13:47

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