Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 26 - Think and Explain: 76

Answer

You see your hand "in the past".

Work Step by Step

Light has a large but finite speed. When you look at your hand, you are receiving the light that left your hand a short time ago. Divide the distance between your hand and your eye by the speed of light to calculate how far back into the past you are seeing. Example: light travels a distance of 30 cm in a billionth of a second. One rule of thumb is that light travels about a foot per nanosecond (actually, about 1.02 ns).
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.