List the colors of the visible spectrum in order of increasing wavelength

violet<indigo<blue<green<yellow<orange<red

Explanation:

The visible spectrum of light is the part of the electromagnetic spectrum which can be seen by humans. The wavelength ranges between 400 nanometers to 700 nanometers.

The visible spectrum is split into seven colors violet, indigo, blue, green, yellow, orange and red (V I B G Y O R). The order of the colors in increasing order is

violet<indigo<blue<green<yellow<orange<red