Usually we can use a seven-color board to demonstrate the synthesis of colored light. The steps are as follows: ① Make plywood or cardboard into a circular plate with a diameter of about 30cm. The cen

Usually we can use a seven-color board to demonstrate the synthesis of colored light. The steps are as follows: ① Make plywood or cardboard into a circular plate with a diameter of about 30cm. The center of the circular plate has (1) was originally a colored cardboard, but it turned white, indicating that white light is a composite color light composed of seven monochromatic lights: red, orange, yellow, green, blue, indigo and purple.

(2) As can be seen from the figure, the proportion of seven colors on the seven-color board is different, which is its characteristic.

(3) Seven colors of light can be mixed into white light. When two colors of wax paper rotate at high speed, another color different from these two colors will be obtained. Therefore, to obtain different colors, we can adopt different color combinations, or keep the color combinations unchanged, but change the proportion of colors.

So the answer is: white light is a multi-color light mixed with seven monochromatic lights: red, orange, yellow, green, blue, indigo and purple; The proportion of different colors of light is different; Use a different color combination, or keep the color combination unchanged, but change the proportion of colors.