Roy g biv...................from left to right....................it goes up in intensity.......particulary wave length..........from troth to troth.........violet has a shorter wavelenght......hence it is more intense..........dvds....use a red laser light.....blue rays......a blue laser..........blue is more intense than red light......hence u can fit more in the same space......which is exactly why a blue ray disk holds more info and has more high def. audio and visual....

Line Name	Opened	Stations	Distance		Termini
			mi	km	Western/Southern	Eastern/Northern
Red Line	1976	27	31.9	51.3	Shady Grove	Glenmont
Blue Line	1977	27	30.3	48.8	Franconia–Springfield	Largo Town Center
Orange Line	1978	26	26.4	42.5	Vienna	New Carrollton
Yellow Line	1983	17	15.07	24.25	Huntington Franconia–Springfield(Rush+)	Mount Vernon Square (rush hours) Greenbelt (Rush+) Fort Totten (other times)
Green Line	1991	21	23.04	37.08	Branch Avenue	Greenbelt
Silver Line	2014	28	29.6	47.6	Wiehle–Reston East Ashburn (opens 2019)	Largo Town Center