👉 Visible electromagnetic radiation. The human eye can typically detect radiation (light) in the wavelength range of about 400 to 750 nanometers. Nearby shorter and longer wavelength ranges, although not visible, are commonly called ultraviolet and infrared light.
Alright class, settle down, let’s take a look!
Today we're diving into something bright, a concept shining with delight – what
is
“light”?
Now, the dictionary gives us a fancy definition, it's true, but let's break it down for me and you.
“Visible electromagnetic radiation,” that’s a mouthful, I know! It means light is actually energy traveling - waves, you see – zooming through space with incredible speed, like a speedy little spree!
It's
electromagnetic
, meaning it has an electric and magnetic field, working hand in hand, you agree?
And our eyes, they’re picky, you must understand, they only catch the light between 400 to 750 nanometers – that’s a tiny little range, a spectrum so neat! Think of it like a slider, adjusting just right for what we can meet.
Now, there's more than just what our eyes can see, don’t you fret and don’t flee! Shorter waves are
ultraviolet
, hidden from view, with energy strong, and sometimes even blue!
And longer waves? They're
infrared
, a warmth we feel in the air, though unseen to us, they're present everywhere!
So, "light" isn’t just what you see when the sun is high, it’s a whole spectrum, stretching far and nigh. It’s energy traveling – don’t forget that fact - with different colors, acting in a spectacular pact!
Does anyone have any questions about this radiant display? Let's discuss!