Tyndall Effect demonstration, why a blue eye looks blue

We all know why the sky is blue, right? I’m attaching a picture which shows an example of how blue light can be “made.” But for the sky, short blue wavelengths of light coming from the sun bounce around a lot more off small molecules less than .5 microns in our atmosphere than other wavelengths of light. More blue bouncing around up there means we see more blue.

I do have one thought about that and color in general. If we see the sky as blue or we see any blue color somewhere, there must be more blue wavelengths that are hitting our retina. Those blue wavelengths are traveling pretty darn fast so the scattering isn’t quite like a slow moving object bouncing around. We’re being bombarded with light instantly. Seeing the sky as blue though must mean there are so many blue wavelengths moving around from in front of our eye to way way up in the sky explaining the blueness. Did that make sense? That’s a long stretch of blue.

 

I’m just gonna drink some more coffee on all this light stuff and maybe see what a clear bottle looks like with a teensy bit of milk in it. That’ll be enough understanding for me today 🙂

 

Oh yeah, why is an eye blue? The Tyndall Effect. Something about the small particles in the middle layer of our iris can scatter blue wavelengths like the picture below. I’m still wondering about why it’s just the stromal layer in the iris that does that but for the mean time, blue eyes are blue because of the Tyndall Effect (also known as Rayleigh Scattering).

tyndall effect demonstration

bottle on left has small amount of milk particles in it and bottle on right is just water

3 Comments

  1. Clear Air Turbulence (CAT) detection, Seeing the Unseen - Right Eyes
    Aug 07, 2013 @ 11:29:48

    […] Tyndall Effect demonstration, why a blue eye looks blue […]

    Reply

  2. Woad, Ultramarine, Cobalt and Lapis, but no Ochre - Right Eyes
    Oct 21, 2013 @ 12:30:59

    […] Tyndall Effect demonstration, why a blue eye looks blue […]

    Reply

  3. Tyndall Glacier - Right Eyes
    Nov 15, 2013 @ 23:11:13

    […] Tyndall Effect demonstration, why a blue eye looks blue […]

    Reply

What do you think?