Lab Report # 1.2: Colored Shadows
Title : Colored Shadows
Materials:
- White Surface
- Red, Green, and Blue colored cellophane
- Three Flashlights
- Any solid object
Diagram:
Materials:
- White Surface
- Red, Green, and Blue colored cellophane
- Three Flashlights
- Any solid object
Diagram:
Results: When all three colors of light were shone on the white surface, the light produced was colored white. When red and green lights were shone on the white surface, the color of the light produced was yellow. When red and blue lights were shone on the surface, magenta-colored light was produced. And when blue and green lights were shone on the surface, cyan-colored light was produced.
Discussion:
The retina of the human eye has three receptors for colored light: One type of receptor is most sensitive to red light, one to green light, and one to blue light. With these three color receptors we are able to perceive more than a million different shades of color.
When a red light, a blue light, and a green light are all shining on the screen, the screen looks white because these three colored lights stimulate all three color receptors on your retinas approximately equally, giving us the sensation of white. Red, green, and blue are therefore called additive primaries of light.
With these three lights you can make shadows of seven different colors: blue, red, green, black, cyan (blue-green), magenta (a mixture of blue and red), and yellow (a mixture of red and green). If you block two of the three lights, you get a shadow of the third color: Block the red and green lights, for example, and you get a blue shadow. If you block all three lights, you get a black shadow. And if you block one of the three lights, you get a shadow whose color is a mixture of the two other colors. If the blue and green mix, they make cyan; red and blue make magenta; red and green make yellow
Conclusion:
When two primary colors of light are added, they will produce a secondary color (Magenta, Cyan and Yellow). Also, not all shadows are black as color of the object’s shadow depends on the color of the light source.
Discussion:
The retina of the human eye has three receptors for colored light: One type of receptor is most sensitive to red light, one to green light, and one to blue light. With these three color receptors we are able to perceive more than a million different shades of color.
When a red light, a blue light, and a green light are all shining on the screen, the screen looks white because these three colored lights stimulate all three color receptors on your retinas approximately equally, giving us the sensation of white. Red, green, and blue are therefore called additive primaries of light.
With these three lights you can make shadows of seven different colors: blue, red, green, black, cyan (blue-green), magenta (a mixture of blue and red), and yellow (a mixture of red and green). If you block two of the three lights, you get a shadow of the third color: Block the red and green lights, for example, and you get a blue shadow. If you block all three lights, you get a black shadow. And if you block one of the three lights, you get a shadow whose color is a mixture of the two other colors. If the blue and green mix, they make cyan; red and blue make magenta; red and green make yellow
Conclusion:
When two primary colors of light are added, they will produce a secondary color (Magenta, Cyan and Yellow). Also, not all shadows are black as color of the object’s shadow depends on the color of the light source.