What happens if light slows down

This is an essay I wrote many years ago on an introduction to Special Relativity.

I repackaged it into a book and it is now available on Lulu.com:

Einstein, Relativity and Light for Kids

Lulu Paperback link

There is also an Ebook version:

Einstein, Relativity and Light for Kids

Lulu Ebook link

Excerpt:

What happens if light slows down – A Beginner’s Guide to Relativity and Light

In the beginning God created the heavens and the earth. And God said, “Let there be light,” and there was light. Light is one of the most ubiquitous things that we see, and it is also one of the oldest – it existed since the beginning of mankind. However, light is also mysterious in that no one really understands what it is and how it is rectilinearly propagated. Nevertheless, the speed of light plays an important part in physics, and it is one of the more often quoted constant. What will happen then, if the speed of light suddenly changes from 300000000m/s to a fraction of its original self –3000 m/s? (It is theoretically possible to slow down light to such a speed, by shining a beam of light through a medium with a refractive index of 100,000.)

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