Oh Christmas Tree, My Christmas Tree #Science and #Poetry for #MerryChristmas

Light Times Two

My Xmas Tree 2015

My Xmas Tree 2015

The speed of light is constant,
That’s what you think you know.
But only in a vacuum.
Through glass it can go slow.

An index of refraction
Predicts the speed of light,
Determines how the wave is bent
On its
transverse flight.

Some light transmits through the glass,
And some will be reflected.
Brewster’s angles, Fresnel calcs,
The focal length
of lenses.

So with great precision,
With science as explainer,
Every light on
my Christmas tree,
In the window,
has a doppelganger.

Kate Rauner

Optics is a fascinating field. Consider the refractive index at wikipedia.

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