We tend to think of light surrounding us, like air. But light travels, always.
Bill is standing 2 meters from his mirror.
Approximately how many seconds will it take a pulse of light to bounce off his forehead, hit the mirror, and return back to his eye?

Assuming that the speed of light is 299,792,458 m/s, and that in order to bounce of Bill's forehead, hit the mirror and return back to his eyes, light must travel 4 meters (distance to the mirror and back) the time that it takes for light to travel is:

[tex]t=\frac{4}{299,792,458} \\t=1.33*10^{-8}[/tex]

It takes 1.33 x 10⁻⁸ seconds.

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We tend to think of light surrounding us, like air. But light travels, always. Bill is standing 2 meters from his mirror. Approximately how many seconds will it take a pulse of light to bounce off his forehead, hit the mirror, and return back to his eye?

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We tend to think of light surrounding us, like air. But light travels, always.
Bill is standing 2 meters from his mirror.
Approximately how many seconds will it take a pulse of light to bounce off his forehead, hit the mirror, and return back to his eye?