The frequencies of visible light are needed in ascending order.
The order is Red, Orange, Yellow, Green, Blue, Indigo and Violet.
The frequency of the different colors of visible light are
Red: 480-400 THz
Orange: 505-480 THz
Yellow: 521-512 THz
Green: 575-525 THz
Blue: 670-610 THz
Indigo: 670-700 THz
Violet: 790-690 THz
Hence, the spectrum of visible light in increasing order of frequency is Red, Orange, Yellow, Green, Blue, Indigo and Violet.
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