Back vowels are sometimes also called "'dark vowels "'because they are perceived as sounding darker than the front vowels.
2.
As for why I say this, some Wikipedia articles say that EE is a light vowel and OO is a dark vowel, meaning that EE sounds much lighter than OO, just as if they had gone with the colors of yellow and blue . talk ) 14 : 00, 18 October 2016 ( UTC)
मोबाइल