Answer Posted / naveen

"VIBGYOR" THE COLOUR COMBINATIONS OF A RAINBOW.
'R' STANDS FOR RED
'Y' FOR YELLOW
'G' FOR GREEN
THE INTENSITY OF THE RED LIGHT IS VERY HIGH COMPARED TO
YELLOW AND GREEN.AND THE INTENSITY OF YELLOW AND GREEN IS
VERY HIGH COMPARED TO VIOLET,INDIGO,BLUE.SO THAT'S WHY
GREEN,YELLOW,RED ARE USED IN TRAFFIC LIGHT.

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