Olaf Roemer, a Danish astronomer, made the first estimate of the speed of light in 1676 by measuring the time it took an eclipse to occur in one of Jupiter's moons. In the 19th century, French physicists Fizeau and Foucault improved methods for measuring the speed of light using rotating mirrors and wheels. From 1880 to 1930, precise measurements were made by American physicist Albert Michelson using Foucault's method. The document also discusses that sunlight separates into the colors of the visible spectrum when passing through a prism, with red, green and blue being the primary colors in light and the most prominent colors the human eye can see.

1. Olaf Roemer

2. Olaf Roemer, a Danish astronomer,
Made the first estimate of the speed
of light in 1676. He did this by mea-
suring length of time an eclipes
occured in one of Jupiter’s moons.

3. In 1849 the French physicist
Fizeau developed the first non-
astronomical method of measu-
ring the speed of light with the
use of an apparatus.
Foucault, another French physicist, improved
Fizeau’s method of measuring the speed of light
by substituting a rotating mirror for the toothed
wheel.

4. From 1880 to 1930 precise measure-
ment was done by A.A. Michelson,
or Albert Abraham Michelson an
American physicist, using the
same method as Foucault’s.

6. Sunlight separates into different
colors, called the visible spectrum,
as it passes through a prism. The
spectrum consist of colors of the
rainbow : red, orange, , green,
blue, violet colors.
The most prominent colors are
red, green, and blue.

7. These are the colors
our eyes are most
sensitive to: red, green,
Blue (RGB) are the
Primary colors In light.
Different combinations
of these colors results in other colors. For
instance, when red and green light are
combined, the result is .

8. Green plus blue is
, and red plus
blue gives
When the three
Primary colors are
Combined, the
Result is .