Answer:
Red, Orange, Yellow, Green, Blue, Indigo, Violet
Step-by-step explanation:
The frequencies of the colours are different and that is what determines what colors we see in order from low to high this are the frequencies:
Color
Red 430–480 THz
Orange 480–510 THz
Yellow 510–540 THz
Green 540–580 THz
Blue 580–610 THz
Indigo 610–670 THz
Violet 670–750 THz
As you can see the lowest frequency is the red, and the highest frequency is the color violet, that is the visible spectrum that humans can see, everything below and above is invisible to the naked human eye.