COLORED SHADOWS
not all shadows are black
MATERIALS
- White surface. : white board
- Red, green, and blue water cellophane.
- 3 flashlights sockets
- Any solid object such as a pencil, ruler, correction fluid bottle, finger, etc.
RESULTS AND 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 the blue and green mix, they make cyan; red and blue make magenta; red and green make yellow.If you turn off the red light, leaving only the blue and green lights on, the lights mix and the screen appears to be cyan. When you turn off the green light, leaving the red and blue lights on, the screen will appear to be magenta, a mixture of red and blue. The shadows will be red and blue. When you turn off the blue light, leaving the red and green lights on, the screen will appear to be yellow. The shadows will be red and green.
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 the blue and green mix, they make cyan; red and blue make magenta; red and green make yellow.If you turn off the red light, leaving only the blue and green lights on, the lights mix and the screen appears to be cyan. When you turn off the green light, leaving the red and blue lights on, the screen will appear to be magenta, a mixture of red and blue. The shadows will be red and blue. When you turn off the blue light, leaving the red and green lights on, the screen will appear to be yellow. The shadows will be red and green.
CONCLUSION
Not all shadows are black, it depends on the color reflected to the board. . 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.
PICTORIALS
Not all shadows are black, it depends on the color reflected to the board. . 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.
PICTORIALS