Would non-visible light be deflected the same way than visible light by a lens? My lessons about optics are long behind me, so I need to confirm a point:
Are IR and UV affected the same way as visible spectrum by a lens?
Let's say someone is able to perceive the full light spectrum. If he is looking through a pair of binoculars, does the effect apply to IR and UV as well?
Edit: I'm curious as whether common glass lens affect similarly all the light, or just visible spectrum.
 A: Basically a lens is a device that refracts light to focus or disperse the light beam. It turns out that refraction of light can be highly frequency dependent, as you can understand for example by looking at the Lorentz model in the context of electromagnetism. The idea is that, if you assume that electrons in your medium behave like objects connected to the nucleus by a spring, you can write down a differential equation for the oscillator and study the frequency spectrum. 
So, to answer your question, also IR and UV light is affected by a lens, but in a different way than visible light is, and also in a way that is dependent on the material you use.
A: Here are two very concrete answers to this question:


*

*you can buy IR film (and digital cameras can be converted for IR), and I have used it.  You typically need to adjust focus for IR: good lenses often had IR markings.  So yes, IR is focussed by ordinary camera lenses.

*ordinary photographic film is often mildly sensitive to UV: a standard purchase in the film era was a UV filter, which would reduce haze due from clear skies, which have a lot of UV and would cause what is essentially flare.  This does not show that UV is focussed by ordinary camera lenses, but I believe it us.


So yes, both UV and IR, within some limits (not too far from the visible spectrum) are focussed by mundane lenses.
