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Why we depicts every diagram studying in ray optics lenses as 'a ray that is passed after retracting from lenses'?

I mean to say , lens is made of glass with non parallel faces so it should disperse light after light is passes through into 7 colors not simply retracting? I thought it same for water but I got to know angle if dispersion is extremely small that light appears mostly undispersed but what happened here? Here lens made of glass with high enough refractive index needed to split ray?

Why we show Only prism dispersing such a great wide spectrum not any 'other medium' in which light refracts ?

Suresh Chandra Pal
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The sort of diagrams to which you refer are highly simplified models of how light interacts with lenses. The lenses do, of course, disperse light- the effect is known as chromatic aberration, and the design of optical system (eg binoculars) requires it to be taken into account and minimised through various techniques. The reason why dispersion isn't shown typically in ray diagrams it that to do so would make them far too complicated for the sorts of scenarios they are designed to illustrate.

Professor Sushing
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