I have been considering this problem:
Colour is characterized by which of following character of light?
Different websites claim different answers; some claim wavelength, some claim frequency. My textbook is an average Indian textbook and has wavelength as the answer. I searched in standard books but did not find the answer.
But, as the wavelength changes from one medium to another medium, frequency does not change, and colour also does not change, it seems confusing to decide between frequency and wavelength. I consulted a teacher as well, he said wavelength, with logic I did not understand, and as he seemed to be in a hurry I did not feel comfortable to prolong the conversation.
https://doubtnut.com/question-answer-physics/statement-1-the-colour-of-light-depends-on-its-wavelength-and-statement-2-on-passing-through-from-on-69130668 //says wavelength but answer mentioned(in the lower section of webpage) is frequency.
https://brainly.in/question/11025304 //says wavelength
What determines color -- wavelength or frequency? //says frequency