SCIENCE MAGIC - MAKE THE COLORED SHADOW

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COLORED SHADOW



Its an amazing game of science, almost like magic. You can play with it for hours. You can learn concepts about light and have practical education with this simple science trick.

You will need
Red, green, and blue light bulbs, one of each color.

INSTRUCTIONS
  • Turn on the lights, and adjust the positions of the bulbs until you obtain the "whitest" light on the area of the screen where the three lights mix. For best results, make the room as dark as possible.
  • Place a narrow opaque object, like a pencil, fairly close to the screen. Adjust the distance from the screen until you see three distinct colored shadows.


SCIENCE BEHIND
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.

IT'S SCIENCE, IT'S MAGIC, IT'S FUN

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