When white light disperses into its constituent colours, the red colour bends the least and blue, the most. Based on this fact, can you explain why the traffic signal at the crossing is made RED for stopping?

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Solution

When white light disperses into its constituent colors, the red light bends less than blue light because the red light has the maximum wavelength.
The color whose wavelength is more gets scattered least.
That's why the red colour is least scattered by the atmospheric dust and other particles and it can travel a long distance.
Therefore, a traffic signal at crossings is made red.

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