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Episode 3 of 5

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Human perception of light is extremely limited. From gamma rays to radio waves what we see is only a sliver of the electromagnetic spectrum.

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Previous Episode:

We Still Don’t Know Exactly What Light Is:    • We Still Don't Know Exactly What Light Is  

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Sources:

Frequently Asked Questions:
http://hubblesite.org/reference_desk/...

“Light is a form of electromagnetic radiation. Visible light is a narrow range of wavelengths of the electromagnetic spectrum."

Electromagnetic Waves Have Different Wavelengths:
http://science.hq.nasa.gov/kids/image...

“When you listen to the radio, watch TV, or cook dinner in a microwave oven, you are using electromagnetic waves."

The Electromagnetic And Visible Spectra:
http://www.physicsclassroom.com/class...

“As discussed in Unit 10 of The Physics Classroom Tutorial, electromagnetic waves are waves that are capable of traveling through a vacuum. Unlike mechanical waves that require a medium in order to transport their energy, electromagnetic waves are capable of transporting energy through the vacuum of outer space."

Visible Light And The Eye’s Response:
http://www.physicsclassroom.com/class...

“As mentioned in the first section of Lesson 2, our eyes are sensitive to a very narrow band of frequencies within the enormous range of frequencies of the electromagnetic spectrum. This narrow band of frequencies is referred to as the visible light spectrum."

What Is The Electromagnetic Spectrum:
http://earthsky.org/space/what-is-the...

“When you think of light, you probably think of what your eyes can see. But the light to which our eyes are sensitive is just the beginning; it is a sliver of the total amount of light that surrounds us."

How Do We See Color?
http://www.livescience.com/32559-why-...

“Roses are red and violets are blue, but we only know that thanks to specialized cells in our eyes called cones. When light hits an object – say, a banana – the object absorbs some of the light and reflects the rest of it."

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